ftorreti

// add a trigger on quantity updated
cur_frm.cscript.qty = function(doc, cdt, cdn) {

cur_frm.add_fetch('item_code','packaging_quantity','packaging_quantity');

var totalBoxes=0;
var nrItems = cur_frm.doc.delivery_note_details.length;
for(var i=0; i < nrItems; i++) {
cur_frm.doc.delivery_note_details[i]['boxes'] = cur_frm.doc.delivery_note_details[i]['qty'] / cur_frm.doc.delivery_note_details[i]['packaging_quantity'];
totalBoxes += cur_frm.doc.delivery_note_details[i]['boxes'];

ftorreti

cur_frm.add_fetch('item_code','packaging_quantity','packaging_quantity');