ARGOMENTO: Trigger lettore barcode e stampa Qwer report

def process_barcode_from_ui(self, cr, uid, picking_id, barcode_str, visible_op_ids, context=None):
        '''This function is called each time there barcode scanner reads an input'''
        lot_obj = self.pool.get('stock.production.lot')
        package_obj = self.pool.get('stock.quant.package')
        product_obj = self.pool.get('product.product')
        stock_operation_obj = self.pool.get('stock.pack.operation')
        stock_location_obj = self.pool.get('stock.location')
        answer = {'filter_loc': False, 'operation_id': False}
        #check if the barcode correspond to a location
        matching_location_ids = stock_location_obj.search(cr, uid, [('loc_barcode', '=', barcode_str)], context=context)
        if matching_location_ids:
            #if we have a location, return immediatly with the location name
            location = stock_location_obj.browse(cr, uid, matching_location_ids[0], context=None)
            answer['filter_loc'] = stock_location_obj._name_get(cr, uid, location, context=None)
            answer['filter_loc_id'] = matching_location_ids[0]
            return answer
        #check if the barcode correspond to a product
        matching_product_ids = product_obj.search(cr, uid, ['|', ('ean13', '=', barcode_str), ('default_code', '=', barcode_str)], context=context)
        if matching_product_ids:
            # Inizio test
            return self.pool.get('report').get_action(cr, uid, matching_product_ids, 'product.etichetta_29mm', context=context)
           # Fine test

def print_product_scanned(self, cr, uid, ids, context=None):
        product_obj = self.pool.get('product.product')
        matching_product_ids = product_obj.search(cr, uid, ['|', ('ean13', '=', ids), ('default_code', '=', ids)], context=context)
        if matching_product_ids:
            return self.pool['report'].get_action(cr, uid, matching_product_ids, 'product.product_label_29', context=context)

print: function(ean){
             var self = this;
             if (self.picking_type_id == 1){
                 return new instance.web.Model('stock.picking').call('print_product_scanned',[[ean]])
                           .then(function(action){
                                return self.do_action(action);
                           });
                 }
               },