Script monitor instance - attribute correlation

I've a few LDAP (custom script) monitor instances with the same attributes
result(numeric code) and message(string). Each script monitor(really the same script file) has a different set of command line options and thus - separate output files generated.
When I'm configuring alerts for particular script monitor instance on Global "Configure alerts" screen (select the particular monitor instance in one of two comboboxes)
the attributes of ALL instances of such script monitor are displayed - for example if I've 5 instances of this monitor - I can see 5 result attributes and 5 message attributes for this ONE particular monitor instance - I've expected that only attributes of this particular instance should be displayed instead of ALL - so one result and one message attributes.
Any thoughts, comments ?