Use the Graphical Data Mapping editor to add input and output messages to your message map.
You can add an input object to your message map by using the Add an input object icon in the toolbar of the Graphical Data Mapping editor:
You can add an output object to your message map by using the Add an output object icon in the toolbar:
When your message map contains all of the required input and output objects, create the connections between them, as described in Adding connections between input and output elements.