FM : 123 FM account assignment xxx/0 M 19B 2 cannot be posted in posting ledger

Dear All,

We are facing the above issue while saving the service entry .

The backgound of this issue.

• The PO was created before the FM area was activated: But i observed that last fiscal year the service entry was posted and GR got created with the fund management elements in the account assignment . But for the new fiscal year the service entry is not getting saved

Kindly guide us to solve this issue .