Workflow for activity alerts

Hi,

I'm trying to create a workflow that will alert my when an activity is created for a set of relationships in Italy but where the activity is now owned by a specific person. 

Here is the trigger I had defined, but it doesn't seem to trigger the workflow at all. 

[<sttDistribution_Channel_ITAG>]='ITALY' AND ([<OwnerExternalSystemId>]<>'1-5XM1F')

and if i use this trigger, the workflow is kicked off for all activities, even the ones owned by Elena

[<sttDistribution_Channel_ITAG>]='ITALY' AND [<stActivity_Owner_ITAG>]<>'Elena Simonova'

Any advice on how I do this?

Thanks,
Jo-Ann