Hi Sanket, It's not possible. Validation rules fire early in the process; if you're using a workflow rule or process builder to check the box, it's already too late for the validation rule to take effect. See the Triggers and Order of Execution document.
It's not possible. Validation rules fire early in the process; if you're using a workflow rule or process builder to check the box, it's already too late for the validation rule to take effect. See the Triggers and Order of Execution document.
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