Existing Item:
eventlog[application,,,Acronis True Image Echo Server,2,]

Created Trigger (can be saved):
((

{Template_Acronis:eventlog[application,,,Acronis True Image Echo Server,2,].regexp(2)}

)#1)

Created Trigger (can not be saved):
((

{Template_Acronis:eventlog[application,,,Acronis True Image Echo Server,2,].regexp(2)}

)#1)&((

{Template_Acronis:eventlog[application,,,Acronis True Image Echo Server,2,].nodata(43200)}

)#1)
-> Error: No such monitored parameter (eventlog[application,,,Acronis True Image Echo Server,2,]) for host (Template_Acronis)

This happens although the Paramter is monitored