How to get data from backend in sup hybrid using generated hybrid js api

Hi All,

I have create a sup hybrid application.

When i am trying to get the data from back-end on the basis of primary key using generated hybrid app api, it is returning me null.

below is the code that i used:

function deleteDepartment() {

var dep = new Department();

dep.dept_id="2";

department_findByPrimaryKey( dep, "" , function(error)

{alert(error)});

}

hwc.processDataMessage = function

processDataMessage(incomingWorkflowMessage, noUI, loading,

fromActivationFlow, dataType) {

alert(incomingWorkflowMessage);

}

alert(incomingWorkflowMessage) is not showing anything.

Please help..

Also provide sample code.

Thanks