Hi 
I need to check when a new issue is creating,
if the parent of this issue equals to Epic:
if it is- the creation will be cancelled
and if it is not equals, just then, the new issue will created
I did it with validator on the creating transition that-
checking if the parent issue, is not equals to Epic,
and if it is not- so the issue will created
it's working well, but not with mine massage error..
waiting to your answer 
