Nota fiscal was set as 'Final'; a new LDC is not possible

What causes this issue?

The flag "Final" was set for this purchase process on the Brazil
Workcenter; a new LDC is not possible.

System Response

A new LDC can't be created for this Future Delivery/Triangular purchase
process.

How to fix this error?

Please check the Future Delivery/Triangular purchase process on the
Brazil Workcenter.

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.