FM items do not create multiple budget entry documents

What causes this issue?

At the present time, the Automatic Budget Postings (ABP) procedure
aggregates multiple Funds Management (FM) item records into a single
budget entry document. However, the data submitted through the FM->ABP
interface should lead to the creation of more than one budget entry
document.

System Response

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

How to fix this error?

Review the permutation of FM items being submitted, during the
transaction, for creation of Automatic Budget Postings.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.