How do I stop workflow transition using the validator based on the value in Custom Field. I was able to develop a Post function which will not change the status. But I was not able to stop the transition.
I know I can hide the workflow transition Button using a Condition statement. But it doesnt suite my requirement.
Use a validator. Conditions block access to the transition, post-functions are for doing updates after a transition is definitely valid. Validators are for checking input during a transition. A validator will check data and return either "true" for "yes, valid information" or "false" for "nope, don't let it happen", with an optional message in the validation.
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