Calculate Custom fields

@Senthil_Kumar check this script, also you can see browser console for error log

frappe.ui.form.on("Task", "budgeted_amount", function(frm) {
    calculate_excess_amount(frm);
});

frappe.ui.form.on("Task", "purchased_amount", function(frm) {
    calculate_excess_amount(frm);
});

var calculate_excess_amount = function(frm) {
    var excess_amount = flt(frm.doc.purchased_amount) - flt(frm.doc.budgeted_amount);
    frm.set_value("excess_amount", excess_amount);
}
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