You can specify the data conveyed by flows, resource flows and message formats from the Data tab of their property sheets.
        
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                Open the property of a flow, a resource flow, or a message format, and click the Data tab.
            
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                Click the Add Data tool to open a data selection list.
                
            
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                Select one or more data, and then click OK to close the selection list, and associate the data with the flow, resource flow or message format.
                
            
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                Click OK to close the property sheet and return to the model.
            
            Note: 
                
You can display the list of data conveyed by a flow or a resource flow on its symbol by selecting  (or Resource Flow) and selecting the Data List radio button.