Using an Apex trigger to update the completion date field on case milestone related list when the case exited the entitlement process...I'm bringing that "Entitlement process End time" to fill in the completion date.
FIELD_INTEGRITY_EXCEPTION, You can’t change the completion date on a case milestone that’s already exited an entitlement process.: Completion Date: [CompletionDate]
Not using the entitlement process end time, how could i get the completion date value when the case exits the Entitlement process?
Also saw this Allow update/completion of Milestones via workflow
any pointers to get this task done either through workflow or Apex?