Trans./ev. type of doc. & not processable w. function &

What causes this issue?

The function is not defined for the
<GL:transaction/event_type>transaction/event type</> of this document.
Using this function, you can only process documents of the
transaction/event type &V2&.

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?

Enter a different document number or process the document with the
function that has been defined for it.
Do you want to <DS:TRAN.MB51>display</> the list of material documents
for the material? If so, you can select by transaction/event type.

Error message extract from SAP system. Copyright SAP SE.