Determining which map to use from RFC Data

I have 3 types of messages that need to be mapped - the one that is called and used will be based on a particular segment in the rfc ( 0 = activate , 1 = modify and 2 = delete ) Where do I set it up to hit the proper map and send the correct message across based on this value? I will have the same scenario on the way back in from the soap adapter ( activate response, modify response and delete response ) everything is asynch.

Any help would be appreciated!