IDoc processing for same message type but diff extensions

Hi

I want to send idoc when a material is changed. Everything is in place and have also done a test scenario. In partner profile i had the message type linked to basic type and tested which is fine. Now i wanted to have one more idoc created for another extension having the same basic type and linked to the same message type. Have maintained the same in WE20 but when i executed BD10 i could only see one idoc been generated but i need to see two idoc (one for basic type and another for the extended) not sure where i'm missing. any pointers on it pls?