Could not post into Budgetary Ledger. Uncheck the final indicator(s)

What causes this issue?

You have activated the budgetary ledger (BL) integrated with the Funds
Management system. You are trying to post either a goods receipt (GR)
or invoice receipt (IR) for purchase order (PO) number &V1&, PO line
item &V2&. This posting would require a posting to the budgetary
ledger; however, the application could not carry out the posting
because either the Delivery Complete or Final Invoice indicator or both
has been previously set causing budget to be returned. Therefore, there
is at the moment no budget available for postings to the budgetary
ledger.

System Response

Posting had to be stopped because there is no budget available to post
into the budgetary ledger.

How to fix this error?

Open up the PO in change mode and ensure that, for PO line item &V2&,
both the Delivery Complete (on the Delivery tab) and Final
Invoice(Invoice tab) indicators are unchecked. This will take back the
budget that has been previously returned and make it available for
future postings.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.