We have a requirement to build the scheduler process to run 3 days before every quarter. The Logic has been built in the expression rule . When I am trying to call the rule in the timer to get the specific day to run, the process is not running whereas when I implicitly paste the logic, it works. Is there any limitations that expression rule can't be evaluated inside the timer.
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I'm a little fuzzy on this, but I think you have to assume the value of the timer expression (whether based on an expression rule, or hardcoded) will be evaluated upon activation of the timer node (or upon publication of the process model for start process timers), and no changes to the value or output of the expression after that point will have any effect.