Creating a Message Type 
You use this procedure to a create message type that defines the root element of a message. A message type comprises of data types, which describe the structure of a message used for communication across systems.
Note
For technical reasons, a data type is not sufficient to describe the instance of a message. According to XML schema, data types are abstract types that are not fixed to an element. You can only describe an instance of a message when you have specified a data type as an element type. Therefore, a message type defines the root element of a message.
You have already created a data type that you want to reference from your message type.
Select a software component version where you want to create your message type.
From the context menu of the software component version, choose .
In the Create Message Type wizard, enter the a name and description for the message type in General Detail section.
In the Data Type Details section, choose Browse to select the data type.
Choose Finish.
Select an existing change list or choose New to create a new change list.
Save the message type.