I found the answer.
The validation check is being done in custom User Exit code in our system.
Location:
Function Group: XCAT
Function Module: EXIT_SAPLCATS_003
INCLUDE: ZXCATU03
I found the answer.
The validation check is being done in custom User Exit code in our system.
Location:
Function Group: XCAT
Function Module: EXIT_SAPLCATS_003
INCLUDE: ZXCATU03