Possibly, but you really don't want to do it with validators.
You should only do things that make changes in transitions during post-functions (or listeners that happen even later). Validators are totally the wrong place.
So, the question is - what do you want to do when the issue moves to complete?
is it possible to verify Epic->some field contains value, when Task " is set to completed.
The task should not be able to be set to Completed, if the Epic->that field is not set.
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What does "epic some field" mean?
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the requirement is that whenever a task is set to complete ,it should inspect the value of a field named ' Documentation Update' in the parent epic to which the particular task is linked . In case the value is not provided, the transition should not be allowed.
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That's another requirement again. The best way to do that is in a "condition", as that would stop the user starting the process to change the status.
However, neither conditions or validators can be scripted on Cloud yet. So I don't think there's any way to do this.
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