When you add an activity or resource to your business process, associate a context variable with those activities and resources that require input or output. Do this by setting context variables for your source or target document instances.
Note: Unwired Orchestrator automatically generates context variable instances for maps and service interactions that conform to the .xsd contained in those resources. The context variable name defaults as the same name of the .xsd file contained in the resource.
To set context references:
In the Business Process Editor, select the activity or resource in your project for which you want to set the 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 field.
In the Set Context Reference dialog box, select a context variable to reference the context. Example
Click OK to save your changes, and close the dialog box.