The RADDBDIF job stops with shortdump PERFORM_NOT_FOUND when it tries to call the non-existing form EXECUTE of RSXPLADA.
The cause is an (incorrect ?) entry in table DBDIFF for PLAN_TABLE_EXTERNAL which has RSXPLADA in column SOURCE instead of SDB3FADA like other objects with DBSYS = ADABAS D.
I changed it to SDB3FADA and the update continued without further problems.
Software versions:
NetWeaver 7.31 SPS 14 before upgrade
NetWeaver 7.4 SPS 9 after upgrade
MaxDB 7.9.08.27
Software Update Manager 1.0 SP 12