Diagnosis
If the error occurs during selection of "Material groups": One of thetwo material group attributes "WGR" or "PRCAT" does not have theproperty "invisible".
If the error occurs during selection of "material grouppresponsibility": One of the two material group attributes "RESP_WGR"and "RESP_PRCAT" does not have the property "invisible".

System Response
The entry/maintenance of material groups on tab page "Extendedattributes" in transaction "PPOMA_BBP" is locked.

Procedure
Call transaction "SM30" and maintain the view of table "T77OMATTR":Select the scenario "BBP" and choose "Attributes/scenario". Inaccordance with the delivery standard, the "invisible" indicator shouldbe selected for attributes "WGR" or "PRCAT" (or "RESP_WGR" and"RESP_PRCAT")