Outbound idoc types in XI

I was creating partner profile using we20 in XI to send and receives idoc of type ORDERS and ORDRSP. In the outbound parmtrs section I am not seeing ORDERS type. I clicked the + sign under the outbound parmtrs, it opened a new page to create a outbound paramets. I did not see ORDERS message type, so I created a message type called ORDERS and ORDRSP using we81. When I came back, I do see the message type I created. Now, I need to select the basic idoc type in the outbound options but I am not seeing ORDERS or ORDERS05 to select. Why isn't XI have the basic IDOCs for ORDERS.

Am I missing something?