May I know how to set process variable to be boolean in process model, plus it always return to be null value and failed to write to database by using process model.
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Your post is very unclear - could you try re-phrasing, and/or simplifying? What is your use case / what are your step-by-step expectations / what issue(s) are you experiencing with each of those steps when you try?
I don't know why my process model always report the data to be saved can't be null, not sure which part I missed which been stagnate me for a month.