Diagnosis
You entered the value &V1& for a returns line as a selection type andtherefore wish to enter a value for &V2&. Due to the fact that returnsonly recognise document numbers and check numbers, this selection valuehas to be calculated in event 0255. The only module entered for thisevent is the example module. This was supplied by SAP and contains theimplementation for check numbers.

Procedure
A relevant function module for event 0255 needs to be created in orderfor the desired selection type to be processed. Notify systemadministration.