Posting and receiving the IDOC to same system(client)

hi friends

we have got a scenario were we are creating an inbound process code and in which one more inbound process code, the thing is we are unable to archieve an IDOC while we are using like this, so we planned to posting an IDOC from same system and then while receiving the inbound FM which is called inside will come into act.

can anybody give me the steps where i can post and receive the IDOC from and to same system.

Thanks in advance

S.Janagar