There is already a confirmed requirement for equi. & on &

What causes this issue?

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?

INCLUDE J_3GCUSTOMIZE_MESSAGE OBJECT DOKU ID TX
IF &DEVICE& = 'SCREEN'
<DS:SIMG.J_3G_MESSAGE>Execute Function</>
ENDIF

Error message extract from SAP system. Copyright SAP SE.