[Solved, even if I don't know how]Problem with Yanfly's transformation and required plugins

Hi guys, it's me, once more ! (Sorry, hey) This time, my problem is with the Buff and States core with the transformations.
Indeed, the tag required the B&Score (abridged for buff & states) and the BEC (Abridged for the Battle engine core), that i need both. But, the transformation works without the engine core ! (Good news, some would say)

But the problem is that I need both of the plugins in my game.

• I tried to delete BEC, and it worked, once here, even off, it doesn't work.
Besides, the BEC present cancels the animation and even the skill, so nothing is made nor inflicted.

• I tried changing the positions of the plugins. Nothing else.

Does someone knows how to change it ?