User macro in items key

[MrBr]

Hi
I'm trying to use "user macro" in items key field
Example:
I've defined host macro {$GROUP_NAME} = customerA
And used it in items key field as following: snmptrap[{$GROUP_NAME}]
It's not working , in debug log i see: "unmatched trap received from [X.X.X.X]"

Same macro perfectly works (i.e. been resolved to it's value) in Name field of an item .
If I replace the key with: snmptrap[customerA] , all starts to work
Debug log says : "query [txnlev:1] [insert into history_log ...... "

According to manual example 1 macro should work

Please help

P.S.
OS - CentOS 5
Zabbix - 2.0.2 then upgraded to 2.0.3

[mbsit]

SNMP Trap is not Agent/Simple check type (example 1).
I don't know macro works for that type of item.

Bests,
Grzegorz