SAP Message >0878 - Reversal of the reversal of a return is not permitted

Diagnosis
You want to reverse the document &V1&.
V1 is the reversal document for the returns document v2.

Procedure
Reversing document &V1& does not make sense. Instead, post the returnagain. The first reversal with document &V1& resets the status of thereturn item to unposted.