SAP Message FMBS123 - FM account assignment &1&2 cannot be posted in posting ledger &3

Diagnosis
The budget structure settings do not allow posting to the FM accountassignment &V1&&V2&. The check of the budget structure ended with thereturn code &V4&.
The system recognizes the following return codes for the check ofposting addresses:

  • Return code 1:

    • The check of posting addresses is switchedon. However the FM account assignment &V1&&V2& is missing in the budgetstructure. Insert this account assignment in the budget structure forthe posting ledger &V3&.
    • Return code 2:

      • The check of posting addresses is switchedoff, but the validation of posting addresses does not allow posting onthis address. Check the implementation of the Business Add-In (BAdI)Validate Budget and Posting Addresses in BS
      .
      • Return code 3:

        • The FM account assignment &V1&&V2& leads to a conflict when you define a
        grouping key within the context of thebudget structure. Check the implementation of the Business Add-In (BAdI)
        Define Grouping Key.
        • Return code 4:

          • The derivation strategy used for deriving the budget address from theposting address derives an invalid budget address. You can use theprogram for displaying of budget structure settings
          to find out which derivation strategy is used. Check the Derivation Strategy for BudgetAddressesin Customizing. This error may also be caused by inconsistentcustomizing of active FM account assignment elements in BCS and FM. Thiscan be checked in IMG activity ActivateAccount Assignment Elements in Budget Control System.

          System Response
          Processing stops.

          Procedure
          Check the budget structure settings according to the given return code.