Hi
Please put the validation rule as under:
Prequisite
BKPF-BUKRS = '1991' AND SYST-TCODE = 'FBA6'
Check
BSEG-BUPLA <> '1991' AND BSEG-SECCO <> '1991'
Message
Business Place and Business Section does not exist
Also post a transaction in system and check the actual t code. For eg, when you post the transaction with F-47, the actual system transaction code is FBA6 and for F-48 it is FBA7.
Thanks & Regards
Sanil Bhandari