def do_partial(self, cr, uid, ids, context=None):
        res = super(stock_partial_picking, self).do_partial(cr, uid, ids, context=context)
        partial = self.browse(cr, uid, ids[0], context=context)
        qz_print_obj = self.pool.get('QzPrint')

        # Select Printable Labels  products
        for wizard_line in partial.move_ids:
            #Quantiny must be Positive
            if wizard_line.quantity < 0:
                raise osv.except_osv(_('Warning!'), _('Please provide proper Quantity.'))
            # Product to print label
            if wizard_line.product_id.label_print is False:
                continue
            else:

                ##  CAll print function from QzPrint class
                # Var num_cop = wizard_line.quantity
                # Var id = wizard_line.product_id.id
                label = qz_print_obj.send_epl_data(cr, uid, [wizard_line.product_id], context)
                return label