Check for the event notification

Dear All,

I have this requirement: the posting of a specific expected event in the EM system should be conditioned to the posting of another specific event: i.e. I can register the expected event EE005 only if the event EE003 was already posted.

Is it possible to have this kind of check, and how?

I know that exists in the rule set the method "ARE_PRIOR_REQS_MET", but it is not what I'm searching for: in fact that method cannot prevent the registration of the event in the EM system, but only the rules that I have in the rule set.

Again, in the expected event profile there is a customizing related to "Expected event requirements" (with a flag for "Predecessor required"), but I have not so clear how it works: someone can help me?

Thank you very much!

Pietro