Hi Csaba,
The best practice is using standard (Business Content) DataSources for the extraction of data from the OLTP system (i.e. SAP ECC):
- 2LIS_03_BF for goods movements;
- 2LIS_03_BX for stock initialization
- 2LIS_03_UM for revaluations.
There is also Business Content in the Data Warehousing system (i.e. SAP BW), e.g. InfoCube 0IC_C03.
Please refer to document How to Handle Inventory Management Scenarios in BW (NW2004) for more information.
Best regards,
Sander