AAPO 176 Error in AIBU transaction code

Hello Experts,

I have a problem in AIBU (AUC settlement) transaction.

In AIBU, i was trying to settle AuC

Then I got AAPO 176 error and it said "Transaction type 250 cannot be used for activity 'Retirement from...............)

But, I don't know where this message comes from and how to solve this issue.

Thank you for your help in advance

Best Regards,

RKP