Reset acknowlegde validity if the status changes.

I installed Xymon 4.2.2 When monitoring for instance the disk capacity I got this unwanted behaviour. I acknowledge a yellow warning with a validity time of 120 minutes. If this warning becomes an error (reaches red threshold) within this period I don't get any mail notification because the validity period of the warning is still active. Can the acknowledge time be reset by a status change? I so, haw can I configure this?

best regards Bart