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if you only want to show the record in a grid, you can simply use a rollup.
If you want to do calculations etc. your expression should be something like $([Incident#.IncidentAssocExternalTask][ISFContact#.ContactAssocByIncident]yourField) or $([link:IncidentLink][link:ISFContactLink]yourField).
Thank you so much for this reply
At this moment , it doesn't work ; i can't save the expression in this format in a Quick Action.
It sounds the HEAT version doesn't undestand the expression.
Have you ever used it in a QA ?
The expression is correct :-)
In fact , i had bad characters in the expression due to the frame editor, where we write the expression in QA
I choosed "Switch to Source Edit Mode" (At right from the Font selection ) to delete the bad characters (copied by...) , and it does well .
Thank You so much