Value &1 is not allowed for field &2

What causes this issue?

Value&SYST-MSGV1& is not valid for field&SYST-MSGV2& because it is not
maintained in the domain values.

System Response

Action cancelled

How to fix this error?

Make sure the value of the field matches the possible domain values.

Procedure for System Administrators

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

Error message extract from SAP system. Copyright SAP SE.