Basic type & is not linked with any logical message

What causes this issue?

Basic type &v1& not yet assigned to a logical message.

System Response

The basic type cannot yet be used in IDoc outbound/inbound processing.

How to fix this error?

Assign a logical message.

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

IF &DEVICE&='SCREEN'
<ds:TRAN.WE82>Execute function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.