Document line & not assigned to IDoc area

What causes this issue?

Assignment is missing of the faulty application document item &V1&
to the IDOC segments. Therefore the status of the fault IDOC items
was not upaded in the error log.

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

System Response

The data could not be processed.

How to fix this error?

This is an internal error in the application upload of the EDI
interface which you cannot correct yourself. Please report the problem
to SAP.

Error message extract from SAP system. Copyright SAP SE.