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Custom JS code on Save not working

I am exploring things in model driven apps using js, so i want to validate the form using basic validation like is the fields empty etc. So I have a js code on form save but when i select save button for the first time without filling anything the errors show up (using set notification error code in js) but after I fill the field and click on submit, the code is not triggering again. I used the same code and instead of set notification i used alerts there it works fine but set notification thing doesn't work. Any idea what am i doing wrong. Here the code snippet.

function validateLeaveOnSubmit(executionContext) {
    var formContext = executionContext.getFormContext();
    var eventArgs   = executionContext.getEventArgs();
    var hasErrors   = false;
    var dummyCtrl = formContext.getControl("sm_dummy");
    dummyCtrl.clearNotification("sm_dummy_req");
    var dummyAttr = formContext.getAttribute("sm_dummy");
    var dummy     = dummyAttr.getValue();
    if (dummy === null) {
        dummyCtrl.setNotification("Please enter dummy value.", "sm_dummy_req");
        hasErrors = true;
    }
    if (hasErrors) {
        eventArgs.preventDefault();
    }
}

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