Resolution:
You may use both external and internal variables in the data source (method argument) and action (argument) specifications when you create a rule. External variables are specified using the form: ${External.&ltvariable-name>}.  Internal variables include: Agent Name, Current Rulebase, Current Rule, Current Test, and Current Action. Internal variables use the form: ${Internal.&ltvariable-name>}. Note that in specifying variables in the data source (method argument), you must enter it manually, whereas in the action (argument), you may use the pull down menu in the action editor - insert button.