Hi Anne,
SUSPEND and RESUME can not be issued as MVS modify command. You may set a specific CLASS for the event, and then issue CLASS command instead.
For example, add CLASS in Event definition:
EVENT ID(XXSTUGRP.MYTEST) CLASS(TESTZZ) SYSTEM(-) REPLACE
Then issue following to suspend it:
F ESP,CLASS TESTZZ SUSPEND
Note: generally CLASS command is meant to affect a group of events. But if there is only one event for the same class, the command will only affect one event. By default, event prefix is the class value.
Hope this helps,
Lucy