By setting source or target header context properties to reference a complex context variable defined using the MessageProperty.xsd file, you can persist message header data separately from message content data and then recombine the two during runtime on output.
To set header context references:
Add the MessageProperty.xsd context variable to your project.
In the Business Process Editor, select the activity or resource in your project for which you want to set the source or target header context reference.
Select Window>Show View>Properties from the menu bar.
In the Properties
View, click in
the Value column of the Source or Target Context Reference Header field.
In the Set Context Reference dialog box, select the context variable that was defined using the MessageProperties.xsd.
Click OK to save your changes and close the dialog box.