You should have the trigger filter condition set to both when you subscribe to one IS document in Parent and Child process…
Then how do you differentiate the data if it is required by Parent or Child ?
In your publishable document, example, if there is a variable under Header like message, which contains ‘parent’ as value for Main process and ‘child’ as value for Referenced process, use the trigger filter condition with these filters which can differentiate the parent and child data and accordingly, the process will get triggered and executed.
-Senthil
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