Diagnosis
InfoProvider &V2& , the characteristic &V1& is uniquely set to thevalue &V3& (COB_PRO-CHACONST = &V3&). A change data record with &V1&= &V4& is thus not permitted.
There is most likely an error in the input readiness controls.

System Response
The changes cannot be saved.

Procedure
Change the query or at least the current drilldown.