diff --git a/db/routines/vn/procedures/item_getAtp.sql b/db/routines/vn/procedures/item_getAtp.sql
index bbf13d396..8266e58da 100644
--- a/db/routines/vn/procedures/item_getAtp.sql
+++ b/db/routines/vn/procedures/item_getAtp.sql
@@ -1,5 +1,5 @@
-DELIMITER $$
-CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`item_getAtp`(vDated DATE)
+DELIMITER $$
+CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`item_getAtp`(vDated DATE)
 BEGIN
 /**
  * Calcula el valor mínimo acumulado para cada artículo ordenado por fecha y
@@ -33,7 +33,7 @@ BEGIN
 			FROM (
 				SELECT
 					itemFk,
-					IF(itemFk <> @lastItemFk OR wareHouseFk <> @lastWareHouseFk,
+					IF(itemFk <> @lastItemFk OR wareHouseFk <> @lastWareHouseFk OR wareHouseFk IS NULL,
 						@lastQuantity := quantity,
 						@lastQuantity := @lastQuantity + quantity) quantityAccumulated,
 					wareHouseFk,
@@ -44,5 +44,5 @@ BEGIN
 			GROUP BY itemFk, wareHouseFk;
 
 	DROP TEMPORARY TABLE tItemOrdered;
-END$$
-DELIMITER ;
+END$$
+DELIMITER ;