No message generated for output of purchasing document &

What causes this issue?

The system was not able to find a message record via the message
determination schema. Therefore it was not possible for such a record
to be generated for this purchasing document. In consequence, the
purchasing document cannot be outputted (printed or transmitted).

How to fix this error?

The message determination process should be checked and, if necessary,
corrected.
The message record can be created manually for this document. For this
purpose, choose the function "Messages" in the menu "Header" and
maintain the necessary data.

Error message extract from SAP system. Copyright SAP SE.