acknowledgment alarms

Dear Support,

I have a little problem with the AML screen. I´ve been working with it without any problem, but I don´t know how, now, the alarms can't be acknowledged or deleted. the buttons are desactivated.

the alarms came from a boolean variable with 1 as alarm, selected in the limits.

I know it's maybe a triviality, but i don't find the solution.

Thanks!