thanks for your reply.
I understand it's only possible use integers on this string.
My question is it possible to change the release version field name to 7.5.0 automatically?
I mean, I create a release and named as 1.0.1, after run the task it devolves a result which is only possible to see on task log. Of course i can manually name the field after check the version returned from script but automatic change makes more sense.