The field OBJNRZ is no longer automatically filled when updating tables FMIFIIT in the standard system starting from the Release 4.5A, and also in the IS-PS as of Release PS/6. Additional key words
The field FMIFIIT-OBJNRZ can be updated through a USER-EXIT as long as the object number has an assignment in the table FMZUOB. This is an error.
SE16 OBJNRZ FMIFIIT FMZUOB EXIT_SAPLFMRI_001 EXIT_SAPLFMOI_001 Cause and prerequisites
The real object number that the user enters in the posting document is Solution
not used in the user-exit as changing parameter C_DEFAULT_OBJNRZ
(refereces FMIFIIT-OBJNR) if the object does not have an assignment in the table FMZUOB.
https://service.sap.com/sap/support/notes/170369 (SAP Service marketplace login required)
Key words : table fmzuob,