How do you set a prerequisite for state change in a custom workflow?

Hi Ralph,

you would need a custom precondition to be written.  OOTB you can control when a parent work item can be marked resolved based on state of its children but not the state transition to other (non-resolve) states.

here are some earlier posts on similar requirement:
https://jazz.net/forum/questions/94059/getting-the-state-of-the-child-workitem
https://jazz.net/forum/questions/118986/can-a-work-item-state-be-changed-depending-on-the-child-work-items-state

and writing an operation participant is the way ahead, here is a workshop to help you with it:
https://jazz.net/library/content/articles/rtc/4.0/extensions-workshop/downloads/RTC40ExtPoT.pdf

hope this helps

I think this can be a pre-condition on Save Work Item Team Operation Behavior..  All Children Resolved.  Described as: Requires that a work item can only be resolved if all of its children are resolved.