Inbound IDoc processing: No file name could be determined

What causes this issue?

During IDoc inbound processing via the file interface, no file name
could be determined. A file name was not transferred and no path and
file name have been configured for the transferred port &v1&.

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

System Response

How to fix this error?

Please transfer a valid file name or maintain a path name and file name
in the port description.

Error message extract from SAP system. Copyright SAP SE.