Port '&' is not permitted for this inbound processing.

What causes this issue?

Port &v1& is not a valid port. Please enter an existing file port for
IDoc inbound processing via file or an existing XML port for IDoc
inbound processing via XML files.

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.