Routine & does not finish with an ENDFORM statement

What causes this issue?

There is no ENDFORM statement in routine &V1&.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Correct routine &V1& and use report RPUGCC00 to generate another
personnel calculation rule check. If this is a routine delivered by
SAP, please contact the SAP telephone service.

Error message extract from SAP system. Copyright SAP SE.