The source BW system must be created and actively saved in the target BW system as the BW source system.
More information: Creating SAP Source Systems
The export DataSource is needed to transfer data from a source BW system into a target BW system.
You can generate an export DataSource for master data, and thus for individual InfoObjects. In this way all the metadata is created that is required to extract master data (all attributes, texts, and hierarchies) from an InfoObject.
Select the InfoObject tree in the Data Warehousing Workbench in the source BW system.
Generate the export DataSource from the context menu of your InfoObject. To do this, choose
.The technical name of the export DataSource is
8******M for attributes (M stands for 'master data')
8******T for texts
8******H for hierarchies
(The asterisks (*) stand for the source InfoObject.)
Therefore, when you create an InfoObject or a master data InfoSource in the source BW system, make sure that the length of the technical name of each object is no longer than 28 characters.