Two items
first item
name test1
type zabbix trapper
key test1
type information unsigned int

second item
name test2
type zabbix trapper
key test2
type information unsigned int

trigger

{zabbix.test.eirc:test1.last()}>{zabbix.test.eirc:test2.last()}

The trigger is triggered, and indicates that the error, although the numbers are equal