[Backport] Error on unique constratins on cretaion for epic related user stories
[Backport] Error on unique constratins on cretaion for epic related user stories

dayatz/taiga-back,xdevelsistemas/taiga-back-community,taigaio/taiga-back,xdevelsistemas/taiga-back-community,xdevelsistemas/taiga-back-community,dayatz/taiga-back,dayatz/taiga-back,taigaio/taiga-back,taigaio/taiga-back