Indesign Script Isolated doAction function

simpleDoActionExample.jsx

// Setup the variables
var theDocument = app.activeDocument;

var myInputs = {};
myInputs.inputDocumentName = "Foo Document Name";
myInputs.inputDocumentType = "Bar Doc Type";

var myOptions = {};

// Call the doAction function
doAction(theDocument, myInputs, myOptions);

// The function with the get and set behavior for textVariables
function doAction(docRef, inputs, options) {

	alert("doAction  " + docRef.name + " \n INPUTS: \n" + inputs.reflect.properties + "\n\n OPTIONS: \n" + options.reflect.properties);


	// Get the current contents
	
	var fooContents = app.activeDocument.textVariables.item ('Foo').variableOptions.contents;
	var barContents = app.activeDocument.textVariables.item ('Bar').variableOptions.contents;

	
	alert("GET textVariable contents \n Foo: \n" + fooContents + "\n\n Bar: \n" + barContents);	

	// Set/Update the contents
	// Why does this not seem to work?

	alert("SET textVariable contents \n Foo: \n" + inputs.inputDocumentName + "\n\n Bar: \n" + inputs.inputDocumentType);	

	app.activeDocument.textVariables.item ('Foo').variableOptions.contents = inputs.inputDocumentName; 
	app.activeDocument.textVariables.item ('Bar').variableOptions.contents = inputs.inputDocumentType; 


	// Script does not seem to reach this point. Why?
	alert("END of doAction");
}