[RM2K3] MULTIPLE CONDITIONS

I'm designing an evented default battle system in rm2k3. Since both character standing pose and character attack animations are battle animations, I created a condition (on the conditions tab) that makes the character invisible when he's afflicted. So, whenever he makes any attacks, I add that condition, show the attack animation, then I remove the condition. It works fine (thanks to whomever suggest me in this forums, I forgot who it was).

I have a problem though. I'm adding actual conditions in my game (like poison), but they conflict. First time I added a condition, the character stopped getting invisible when attacking. I made the "invisible" condition have a higher priority, and it fixed the problem. But after my character attacks, the "poison" condition disappears. Is it because a character can't have more than one condition at a time? Is there a way around it?