The combination entered for & is not permitted

What causes this issue?

The combination of values for &V1& is not permitted.

System Response

The system discontinues processing.

How to fix this error?

Correct your entry and perform the activity again.

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

The following entries are permitted for the point of departure:
either shipping point
or country of departure and departure zone
The following entries are permitted for the point of destination:
either customer number
or destination country and receiving zone.

Error message extract from SAP system. Copyright SAP SE.