Inconsistent PBC document - missing positions

What causes this issue?

A document for Position Budgeting and Control (PBC document) was
processed without a number.

System Response

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

INCLUDE PAOC_FPM_NA_SYSRES OBJECT DOKU ID TX

How to fix this error?

Check the messages in the run log.

Procedure for System Administrators

Reconstruct the documents for the affected account assignment.

Error message extract from SAP system. Copyright SAP SE.