Trigger fires as many times as items involved

[Bundes44]

Hy,

I am quite a noob in Zabbix, I tried to configured a trigger like this :

{OXE:busychan_[{#SNMPINDEX}].last()}= {OXE:totalchan_[{#SNMPINDEX}].last()}
and {OXE:ooschan_[{#SNMPINDEX}].last()}=0
and {OXE:busychan_[{#SNMPINDEX}].last()}> 1

The thing is that this trigger fires three times when it fires.
I guess its because three items are involved.

Is there a way to trigger only once ? (I would like it to fire each time the entire rule is true)

Thanks for your help.

Regards.

Bundes.