Diagnosis
You made a Customizing setting for the function module &V2& for thedata preselection for the report &V1&.
An error was found when the system was checking to see if the functionmodule exists

System Response
The error value is &V3& uand means that
CASE '&V3&'
WHEN '2'the function module does not exist
WHEN '3'the name of the function module has the wrong format
WHEN OTHERSthere is an internal error.
ENDCASE

Procedure
IF '&V3&' = '21' OR '&V3&' = '3'
Enter an existing function module in the Customizing fieldFunction module in theMandatory options view.
ELSE
Create a SAP problem message.
ENDIF