Erol Tel
Independent Study
Experience
Continental AG
- Analyze and fix data flows between PMD and SAP HR/S4 systems using SAP PI/PO and ABAP, especially in the HR area.
- Provide integration services by developing, customizing, and troubleshooting issues in custom interfaces and processes.
- Participate in technical and functional discussions to align the HR system architecture and integration strategies.
- Ensure system stability and data accuracy by proactively identifying and resolving integration issues to contribute to ongoing project success.
- Transfer HR data via OData service to SuccessFactors ABAP-OO report: access LDAP user data alongside SAP user data and update the email address and Windows ID in SAP.
- S/4 HANA, ABAP/4, ABAP-Object, S/4 HR, FI, SoapUI, Postman, REST API, JSON.
ITSCare
- Shift and lift migration of ABAP reports, function modules, classes, and methods.
- Adapt ABAP objects according to the new S4 development guidelines.
- ABAP ATC checks.
- CRM-GKV: S/4 HANA, ABAP/4, ABAP-Object.
VHV-Group
- Generate service providers in SE80.
- Implement technical solutions using proxies and reusing function modules from existing RFC interfaces (check collection lock, retrieve dunning history, retrieve posting history, etc.).
- Configure and generate proxies and web services in SAP (Trx.SOAMANAGER).
- S/4 HANA, ABAP-Object, ABAP-Proxy, S/4-CD, FI, SOAMANAGER, SoapUI.
Independent Study
SAP BTP Trial Version
- Access SAP BTP trial version and SAP Integration Suite.
- Independent study of various CPI scenarios: email sending, file-to-file, HTTPS-to-JDBS, general CPI mapping, data store with OData to SFTP, iFlow, sending JSON data via POST to external REST API, XML file to SFTP, HTTP to SOAP, general monitoring.
- SAP BTP trial version, SAP Integration Suite, SoapUI, Postman, JSON, XML.
Lufthansa Industry Solutions
- ABAP OO development in the SAP HCM module (PA, PY, BAV).
- Archive customizing and ABAP report programming for mass distribution of PDF documents (personnel account, social security certificate, income tax certificate, travel expense report, etc.) to a new print server.
- PDF processing: encryption/decryption, PDF/1A conversion, zipping, merging, and archiving.
- Create forms with Smartforms.
- Analyze reports, function modules, and classes/methods to replace infotype 0005 (leave entitlement) with infotype 2006 (absence quotas).
- ABAP/4, ABAP-Object, SAP HCM, BAV, Time Management (PT), Payroll (PY), SAPscript, Smartforms, SAP PO 7.5, ALE/IDoc, JIRA.
Landschaftsverband Rheinland IT-Dienstleister (LVR-InfoKom)
- AIF interface implementation for inbound and outbound PI proxy, IDoc and file as well as AIF mapping customizing.
- Migration of SAP interfaces from SAP ERP to SAP S/4.
- PI/PO mapping developments using SOAP, IDoc, RFC and REST adapters.
- Working with Runtime Workbench, Integration Builder, Enterprise Service Builder, System Landscape Directory, NetWeaver Administrator and XPI Inspector.
- Proxy developments: inbound (purchase order, order confirmation, picking automation) and outbound (invoice to orders, material stock).
- ALE/IDoc development and customizing: reservation, goods movement, goods receipts for purchase orders.
- SD SmartForms invoice programming and form creation, as well as automatic email sending of the invoice as PDF.
- Customizing message control and SD workflow error analysis for customer order approval.
- S/4 HANA, ABAP/4, ABAP Objects, ABAP proxy, S/4 SD, MM, FI, AIF, JIRA, PI/PO, ALE/IDoc.
Migros Genossenschafts-Bund
AIF development: AIF interface implementation for reporting and inbound and outbound PI proxy.
AIF customizing interface development in ABAP Objects, ABAP proxy and PI/PO.
Outbound: transfer of archived documents stored in FB03 (Word, PDF and text files), profit center and budget values, as well as loss data and inventory.
Inbound: providing cost center and profit accounting plan data, as well as invoice receipt processing.
Development of oData service (SEGW): experience with SAP NetWeaver Gateway FIORI app debugging to identify S/4 standard oData and integrate modifications for customer requirements, e.g. for the settlement run of planned stock transfers.
Data migration SAP CO to S/4: development of CO data upload for actual/plan contribution margin accounting and overhead costs via BAPI.
Development: transfer of CO plan data (Excel upload/PO inbound) from custom tables to the ACDOCP table using SAP standard class/method.
ALV CO planning cockpit for actual/plan data development using Eclipse ABAP Development Tools.
ALE distribution model: customizing and development of ALE distribution model for CO master data COSMAS, COELEM, GLMAST, PRCMAS and COGRPx.
IDoc extension RE-FX: implementation of BADIs to fill custom fields for construction & real estate.
Report extension after S/4 transformation (billing rule).
RFC development for live queries: FI archived documents for cost centers, CO line items for cost center audit and cost center actual/plan data.
CDS table function: CDS entity with AMDP class/method or SQL script development.
CDS view with associations/joins, ABAP RAP development of service definition, service binding and publishing.
oData service connection to FIORI app master data check (G/L accounts, profit centers, cost centers, etc.) and defining the tile in Fiori.
Creating VDM (Virtual Data Model): interface view, composite view, consumption view and oData services with UI annotations.
CATS migration to S/4: extending already implemented user exits and checking functionality on S/4.
CDS views for BW data extraction: vendor mapping and cost center hierarchies.
BW development: vendor line items (0FI_AP_4/0FI_AP_30) with additional fields for partner, Migros identification number, region and institution.
CDS view as extractor in S4, creating and programming start and end routines in transformations, as well as extending process chains and creating DTP.
Definition of events to trigger process chains (SM64).
General: analysis and design of applications in SAP S/4 FI/CO module.
Initialization and rebooking of static key figures via BAPI.
CO line item Excel download report for the Axeba Service Management System.
Extensive ALV reports and ABAP unit testing.
Actual analysis with ATC code check, ATC configuration and user-exit programming to comply with developer guidelines.
Creating a check variant for Code Inspector.
S/4 HANA, ABAP/4, ABAP Objects, BW/4HANA ALV Report, OO-ALV, S/4 FI/CO, RE-FX, AIF, JIRA, SIGNAVIO, Confluence, Solution Manager, Scaled Agile Framework (SAFe).
Deutsche Post AG
- Analysis, design and development of applications in the SAP HCM module (PA, PY, BAV) using ABAP/4 and ABAP Objects.
- Maintenance and enhancement of customer-specific infotypes, and creation of forms with SmartForms, HR forms and SAPscript.
- IT system modeling and technical requirements analysis as a business analyst.
- Development of data migration programs, analysis reports and correction programs for infotypes.
- Creation of evaluation classes for payroll elements and programming of dynamic actions.
- Programming and enhancement of the customer's payroll schema (RPCWPCD0, RPCALCD0).
- Extension of the consumer web service for mass printing systems and setup of monitoring reports.
- ABAP/4, ABAP Objects, ALV Report, OO-ALV, SAP HCM, BAV, Personnel Time Management (PT), Payroll (PY), SAPscript, SmartForms, HR forms, WinSCP.
SEG-Automotive GmbH
- Preparation and analysis of migration from the EDI Bosch system to the EDI SEG system (AXWAY).
- Data manipulation for exchanging IDocs via RFC communication.
- SAP connection to EDI system (AXWAY): ALE-IDOC customizing, port, partner and interface programming.
- ABAP Object report for storing and archiving EDI documents.
- LSMW configuration for data transfer.
- Testing the sales planning process in SAP and APO-PP/DS after ALE-IDoc process changes.
- ABAP/4, ABAP Objects, OO-ALV, SAP SD, MM, FI, EDI, RFC, IDoc, ALE, LSMW, APO-PPDS.
Deutsche Post AG
- Creation and enhancement of customer-specific infotypes (including related dynpro and dynpro logic).
- Maintenance and development of interfaces, web services and remote-enabled function modules.
- Analysis and design of applications in the SAP HCM module and their development.
- Creation and maintenance of forms with SmartForms, HR forms and SAPscript.
- Support of various SAP customer applications and SAP users, as well as IT system design.
- ABAP/4, ABAP Objects, SAP HCM, SAPscript, SmartForms, HR forms.
Roche Diagnostics GmbH
- CIF user-exit programming in SAP and APO as well as plausibility checks in gATP and master data.
- BADI macro extension for DP and adjustments in Alert Monitoring.
- SAP MRP overview report for consolidated presentation of product information (stock, quantities, consumption).
- Extension of transaction /SAPAPO/PPT1 with functions for direct calls to SAP transactions (MD02, MD04, MMBE).
- Analysis and preparation for the APO HANA migration.
- ABAP/4, ABAP Objects, BW/BI, APO-DP, PP/DS, gATP, SAP-SD, MM.
SNP AG / Bosch AG
- BI/BW mass data migration between BW systems using the SNP Transformation Cockpit tool.
- Monitoring, error analysis, error correction and creation of transformation rules for consolidation of company codes.
- Development of reports/function modules to generate transformations/DPT and request transfers.
- Selection from ERP export files and report generation of SQL SELECT statements.
- ABAP/4, ABAP Objects, BW/BI, SNP Transformation Cockpit tool, JIRA.
Bader GmbH
- Development, extension and customization of various SAP programs for SD, MM, QM, PP, PS, HR, FI and CO.
- Reporting, dialog and ABAP object programming.
- SAPscript and Smart Forms programming as well as form design.
- ABAP/4, ABAP Objects, SAP-SD, MM, QM, PP, PS, HR, FI, SAPscript/Smart Forms.
Gebrüder Heller Maschinenfabrik GmbH
- BPC-BI-SAP integration: data modeling and development of a retraction BADI for planning data transfer.
- Development of a complex cockpit program (OO-ALV) for further processing of BPC data in MS Access and BIBPC.
- BI development: creation of process chains, data sources, infoproviders and transformations, as well as custom extractor programming for SD, MM, FI, CO, CS and HR.
- Execution of V3 updates with LBWE for delta queue transfer.
- Development of reports with BEx Analyzer and BEx Query Designer (aggregates, key figures).
- SD/CS/PP/PS/MM/QM: extension of various reports and BADI implementations.
- ABAP object report for serial number recording in assembly.
- Error analysis and extension of CATS functionalities via user exits.
- SAP-MS Access integration to enrich production planning data.
- ABAP/4, ABAP Objects, OO-ALV, SAP-SD, MM, QM, CS, PP, PS, BPC, BW/BI, Smart Forms.
Kärcher GmbH
- SNP/DP: development of databases, dynamic alerts and macros.
- SCM-BW configuration and custom extractor programming for MM and SD.
- Creation of process chains, data sources, infoproviders, transformations and user exits.
- Management of planning object structures, navigation attributes and data views.
- Implementation of SAP standard macros for passing planning key figures from DP to SNP.
- APO-DP/SNP, SAP-SD/MM, ABAP/4, BW 7.0.
TÜV SÜD Informatik und Consulting Services GmbH
Development, enhancement and adaptation of various SD, MM, PM, PS, HR and FI programs (reporting, dialog and ABAP-OO).
Form design and programming with SAPscript, Smartforms and Adobe Forms (billing, credit memo, partner agreement).
Implementation of BADIs, SMOD, user exits, enhancement points and VOFM routines.
Worldwide second-level support in the competence center for various SAP modules and interfaces.
Extension of standard transactions with custom Z fields.
Development of reports for SD bonus, FI accruals, FI stock posting via XML upload and CO interfaces.
HR developments: master data processing, payroll statement for internal cost allocation, pay statements and HR/CO harmonization.
IDoc/ALE: creating distribution models and enhancing electronic invoice delivery.
MDM (Master Data Management): IDoc and RFC interface connection for transferring open items and master data updates.
CATS (Cross Application Time Sheet): enhancement of functionalities, using the CATS DB and implementation of user exits (CATS0001 to CATS0012).
SAP Floorplan Manager (FPM) and WebDynpro: enhancements via user exits and development of additional search helps.
BW standard extraction routines: implementation and enhancement for data transfer from SAP R/3 in FI, HR and SD.
Development of SD provider web service interfaces for sales orders, billing and payment status.
Development of FI provider web service interfaces for third-party service invoices.
Development of PM consumer web service interfaces for equipment and reservations.
Configuration of web services with SOAMANAGER (SAP to SAP / non-SAP).
REST API integration for electronic PDF signatures via Adobe Sign.
Migration SAP PI 7.31 (dual-stack) to PI 7.5 (single-stack) including connectivity setup (SOAP, IDoc, RFC, SFTP).
XI/PI development: SLD configuration, graphical mappings, UDFs and proxy development.
Transaction data interfaces: ABAP proxy to XML for SD, MM, FI and HR (employee data, internal orders, time data).
Intercompany invoices: synchronous validation and posting via BAPI within the ABAP proxy between companies.
Master data transfer via SAP IDoc to external systems (material, customer, vendor master).
PI monitoring report for tracking incoming interfaces.
ABAP/4, ABAP-Object, ALV, OO-ALV, SAP-SD, MM, PM, PS, FI, HR(PA/PY), MDM, CATS, SAP XI/PI, REST-API, Adobe Forms, JIRA, Solution Manager.
Panasonic
- APO-DP: unit testing, documentation and bug fixing of planning books and macros.
- Development of user-function macros and macro BADIs.
- Implementation of complex process chains.
- APO-BW: bug fixing of start, end and expert routines as well as BW/APO mapping logic.
- ABAP/Object: modification of the CVC generation report and programming of BADIs.
- APO-DP, ABAP/4, BW 7.0.
Hugo Boss
- APO-CTM prototype development: CIF interface customization between AFS and APO.
- CIF user-exit programming in AFS and APO.
- Setup of CTM profiles and SNP planning books for result analysis.
- APO-SNP customization, configuration and BADI development (hierarchies, planning book icons).
- BW virtual InfoCubes/transformations and query/workbook creation.
- SAP-AFS development: programming reports and user-exit modifications for APO data extraction.
- APO-CTM, SNP, SAP-AFS, ABAP/4, BW 7.0.
T-Mobile
- APO implementation for T-Mobile Croatia: CIF interface customization and CIF user-exit programming.
- Setup for demand planning (DP) and supply network planning (SNP), including reporting and alerts.
- BW data modeling for APO DP data transfer and SCM-BW configuration.
- Development of SCM authorization concepts and custom report enhancements (SNP to DP extraction).
- ABAP-ALV maintenance report for product/location attributes.
- Support for SD/MM/PP: analysis, troubleshooting, performance optimization and IDoc/EDI/ALE development.
- APO-DP/SNP, SAP-SD/MM/PP, ABAP/4, BW 7.0.
Johnson & Johnson
- APO-CIF development: transfer of special purchasing info records.
- Customization of ATP categories for stock transfer inventory via BAPI.
- XI APO integration: generation of SOAP data sources and implementation of SOAP RFC function modules.
- Proxy development for populating the BW delta queue and controlling process chains.
- APO extractor programming for master and planning data via BAPI.
- Technical/functional analyst: support for offshore developers, programming complex routines and working with Solution Manager/Mercury Quality Center.
- ABAP/4, ABAP-Object, APO-DP/SNP, BW/BI, SAP-SD/MM.
BASF
- Worldwide optimization and harmonization of sales, planning and procurement processes.
- Development of a global template solution (planning workbooks, InfoCubes, macros, process chains).
- Consolidation of APO DP and SNP solutions for agricultural products in Europe, Asia and America.
- Creation of global virtual providers for reporting and standard InfoCubes to ensure data integrity.
- Complex BEx queries and workbooks.
- Re-modeling of alpha code determination using ABAP Objects and macro user functions.
- ABAP ALV and dialog programming to generate characteristic combinations.
- ABAP/4, ABAP Objects, APO DP/SNP, BW/BI, SAP SD/MM.
John Deere
- Extension of standard extractors to transfer data from SAP R/3 (MM, PP, SD, FI, CO, WM).
- Programming of update and start routines.
- Data extraction from BW as flat files via Open Hub Service / InfoSpoke for archiving purposes.
- SAP SD reporting on deliveries, backlogs and supplier evaluations.
- Job monitoring including error analysis and resolution.
- Connecting APO to BW for forecast quality measurement via queries.
- Analysis Process Designer (APD) solutions for duplicate checking and loading historical data.
- Release upgrade of BW 3.5 to NetWeaver BI 7.0 and R/3 46C to mySAP ERP.
- Activation of Business Content for customs documents (SAP GTS).
- BW/BI, BPS, BI Integrated Planning, SAP MM, PP, SD, CO, FI, WM, ABAP/4, APO DP/SNP.
Glaxo Smith Kline
- Second-level support in the competence center for SD, MM, FI, ABAP, APO, SRM and BW.
- Customizing and programming of requirements in SD, MM and FI.
- BW: monitoring data, creating queries with BEx Analyzer and performance optimization.
- SRM: workflow approval setup, adjustment of user attributes and program modifications.
- APO SNP/DP: planning month-end closings and extending macros.
- APO DP/SNP, BW, SRM, SAP SD/MM/FI, ABAP/4.
T-Systems
- Adding and integrating custom programs into mySAP CRM 4.0.
- Adapting and further developing existing ABAP object programs.
- Using controls such as ALV Grid and ALV Tree.
- ABAP/4, ALV, CRM.
BASF
- Analysis of budget planning processes and design of new interactive sales planning.
- Creation of planning workbooks, InfoCubes and macros for budget calculation.
- Implementation of user-exit macros to control input readiness and currency conversion.
- Various ABAP reports for budget data preparation.
- Creation of BEx queries with variables, key figures and authorization objects.
- Object-oriented ALV reports for characteristic combination maintenance.
- APO DP, BW, ABAP/4.
Elektrolux
- EAI integration with webMethods Integration Server (MQSeries, JDE, DB2) for customer master data transfer.
- Building business linkages for sales orders and invoices.
- Modeling and monitoring business processes with webMethods Modeler/Monitor.
- Data mapping with webMethods Flow Language.
- Specifying and validating XML documents, schemas (XSD, DTD), and flat files.
- webMethods, MQSeries, SQL Navigator, XML-SPY, XSD, DTD.
Hewlett Packard
- MM/SD customizing: point of contact for purchasing, inventory management, pricing, and message control.
- ABAP Objects: implementing BADIs (e.g., BADI_MATERIAL_REF) and graphical list models.
- ALE/IDoc: connecting SAP to external data warehouse systems and IDoc interfaces for order, invoice, and delivery data.
- SAP Business Workflow: setting up customizing and developing new workflows in SD and MM.
- SAPscript & Output Determination: designing layouts and developing print programs.
- Interface Manager Tool (IM/3): developing interface programs and UNIX scripts.
- Release upgrade from 40B to 46C: adapting reports and customizing.
- Reporting: performance optimization with SE30 and development of ALV reports and BAPIs.
- APO-DP and SNP 3.0A: customizing the CIF interface for master and transaction data.
- Programming CIF user-exits for material and plant filtering.
- Automatic creation of integration models and data export from LiveCache.
- Creating planning books and macros for product forecasts.
- Excel VBA development for creating PC files for APO-DP.
- SAP BW development: modeling InfoCubes for MM and SD, and creating InfoObjects and InfoSources.
- Scheduling data load processes via InfoPackages.
- Performance optimization through aggregations and monitoring in the PSA.
- Frontend: creating queries and web applications with BEx Analyzer.
- EAI with webMethods: connecting BAPI, ALE, and RFC for processing customer orders and product prices.
- Data mapping for RosettaNet, BizTalk, and Golden Standard.
- Developing Java programs in webMethods and PL/SQL programs with Quest SQL Navigator.
- ABAP/4, BAPI, BADI, Unix scripts, SAPscript, ALE IDoc, webMethods, SAP R/3 SD/MM/PP/FI, APO-DP/SNP, BW/BEx.
Hugo Boss AG
- Release upgrade from 3.0B to 4.0B, including SPAU list adjustments.
- Reporting: developing interactive reports for line-item and flat-rate adjustments for subsidiaries.
- SAP R/3 development on FI and CO, release 4.6c.
IBM AG
- Variant configuration in logistics (SD/MM/PP): mapping product-specific processes.
- Working with configuration profiles, classes, characteristics, and object dependencies.
- Developing function modules for material/characteristic relationships.
- SAPscript & Output Determination: generating layouts and print programs for invoices, shipping, and orders.
- ALE/IDoc for SD: sending invoice data to EDI subsystems.
- CATT tool: automating master data maintenance (materials, documents).
- SAP-SD, MM, PP, IS-SW, SAPscript, ALE, IDoc, ABAP/4, CATT.
Beneke-Kaliko / Continental AG
- SAP enhancements: user-exit for sequencing in capacity planning.
- SAPscript & Output Determination: generating layouts and print programs for PP and SD.
- Developing an SAP interface to a quality assurance system.
- SAP R/3 SD, PP, MM, QM, ABAP/4, SAPscript.
Frankfurter Hypothekenbank
- Improving the performance of ABAP reports and function modules using the Runtime Analysis Tool (SE30).
- Programming job chains.
- Documenting and testing programs for batch job processes.
- ABAP/4, SAP-FI/IS-B.
Industries Experience
See where this freelancer has spent most of their professional time. Longer bars indicate deeper hands-on experience, while shorter ones reflect targeted or project-based work.
Experienced in Information Technology (21 years), Manufacturing (7 years), Retail (3.5 years), Transportation (2.5 years), Automotive (2 years), and Chemical (2 years).
Business Areas Experience
The graph below provides a cumulative view of the freelancer's experience across multiple business areas, calculated from completed and active engagements. It highlights the areas where the freelancer has most frequently contributed to planning, execution, and delivery of business outcomes.
Experienced in Information Technology (27.5 years), Business Intelligence (14.5 years), Supply Chain Management (10.5 years), Finance (4 years), Human Resources (3.5 years), and Logistics (1.5 years).
Summary
I have deep expertise in SAP system integration and development using ABAP/4, ABAP-Object, and related technologies. I have worked on ensuring data accuracy, system stability, and seamless migration between various SAP modules such as HCM, FI/CO, SD, and APO. Through my work, I have streamlined complex data flows and built robust interfaces with hands-on experience across S/4 HANA, SAP PI/PO, and SAP Integration Suite.
I excel in analyzing technical challenges, adapting systems to new guidelines, and designing processes that drive efficiency in diverse industries. My background in self-directed study and real-world SAP implementations has given me a strong foundation to deliver reliable and effective solutions.
Skills
Focus:
- Application Programming Interface Technology Business Application
Programming Languages:
- Abap4
- Abap-object
- Webdynpro For Abap
- Basic
- C
- C++
- Clipper
- Dbase
- Java
- Javascript
- Pascal
- Pl/sql
- Excel-vba
Operating Systems:
- Real-time Operating Systems
- Hpux
- Ms-dos
- Os/2
- Unix
- Windows
Databases:
- Db2
- Informix
- Oracle
- Sql
- Xbase
Networks And Communication:
- Edifact
- Rfc
- Tcp/ip
- Windows Networking
Tools And Methods:
- Abap/4
- Abap-object
- Oo-alv
- Abap-dialog
- Webdynpro For Abap
- Sap R/3: Sd, Mm, Pp, Ps, Co, Fi
- Bw/bi
- Apo: Dp, Snp, Ctm, Pp/ds
- Ale
- Workflow
- Bapi
- Catt-tool
- Im/3-tool
- Sapscript
- Smartforms
- Adobe Forms
- Sapconnect
- Webmethods
- Xmlspy
- Sap Xi/pi
- Abap Proxy Development
- Webservices
- Soap
- Xml
- Jira
- Solution Manager
- Magic Service Desk Express
- I-net Help Desk
- Soapui
- Postman
- Rest-api
- Json
- Winscp
Industries:
- It
- Banks
- Automotive
- Textile Industry
- Chemicals
- Pharma
- Telecommunications
- Mechanical Engineering
- Pension Services
- Retail
Languages
Education
Diploma in Computer Science (University of Applied Sciences) · Computer Science
Profile
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