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

Hi All,

I have create a sup hybrid application in SUP 2.2.

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