Diagnosis
You want to
IF &V2& = 'X'.
process
ELSE.
issue
ENDIF.
a message at item level with the target group "vendor".
To do this, a message schema for item messages must be entered inpurchasing grouping &V1&.

System Response
As no message schema for item messages is entered in purchasinggrouping &V1&, the required function cannot be performed.