Diagnosis
There are material groups that do not have a matching product category e
ntry.

System Response

Procedure
Make sure all product category master data is loaded into BI. The master
data for 0PROD_CATEG has to be filled with all product categories thatare available within SRM. All material groups that are replicated fromthe SAP backend system to SRM have to appear as an attribute of 0PROD_CATEG.
This behaviour is normal for all material groups that are not replicated
to SRM and are not part of the SRM product category hierarchy. Forthose material groups no further action is required.