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Field update rule does not work if the source is a formula?



I am trying to use a workflow to update a Field, the source Field is a formula (referencing another object). The target Field is not being updated.


Field B  (Object Y) = Field A (object X)

When Field B is changed, updated Field C (object Z)

Object Y is junction object, in Master-Detail relationship with Object X and Z


I do not want to use a trigger.


Thanks for your help.

Best Answer chosen by Admin (Salesforce Developers) 
Steve :-/Steve :-/

I think the problem is that you're trying to trigger off a Formula field, I don't think that can be done in a WFR.