Nancy,
I only use SUPPRESS when I am also using CONTINUE in an Xlate to cut multiple xlated messages from one source message.
Some folks do message filtering in an Xlate by using IF Actions combined with the SUPPRESS action.
We prefer doing our filtering in a generic, reusable Tcl procedure designed for message filtering in the message routing (pre-xlate).
I know of no good reason to just unilaterally use SUPPRESS.
But perhaps I misunderstand your question and/or the comment made in class.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 60 years IT – old fart.