diff --git a/db/routines/vn/procedures/itemShelvingSale_addBySaleGroup.sql b/db/routines/vn/procedures/itemShelvingSale_addBySaleGroup.sql
new file mode 100644
index 000000000..285b9f93f
--- /dev/null
+++ b/db/routines/vn/procedures/itemShelvingSale_addBySaleGroup.sql
@@ -0,0 +1,46 @@
+DELIMITER $$
+CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`itemShelvingSale_addBySaleGroup`(
+	vSaleGroupFk INT(11)
+)
+BEGIN
+/**
+ * Reserva cantidades con ubicaciones para el contenido de una preparación previa
+ * a través del saleGroup
+ *
+ * @param vSaleGroupFk Identificador de saleGroup
+ */
+	DECLARE vDone BOOL DEFAULT FALSE;
+	DECLARE vSaleFk INT;
+	DECLARE vSectorFk INT;
+	DECLARE vSales CURSOR FOR 
+		SELECT s.id
+			FROM saleGroupDetail sgd
+				JOIN sale s ON sgd.saleFk = s.id
+				JOIN saleTracking str ON str.saleFk = s.id
+				JOIN `state` st ON st.id = str.stateFk
+					AND st.code = 'PREVIOUS_PREPARATION'
+				LEFT JOIN itemShelvingSale iss ON iss.saleFk = s.id
+			WHERE sgd.saleGroupFk = vSaleGroupFk
+				AND str.workerFk = account.myUser_getId()
+				AND iss.id IS NULL;
+
+	DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDone = TRUE;
+
+	SELECT sectorFk INTO vSectorFk
+		FROM operator
+		WHERE workerFk = account.myUser_getId();
+
+	OPEN vSales;
+	l: LOOP
+		SET vDone = FALSE;
+		FETCH vSales INTO vSaleFk;
+
+		IF vDone THEN
+			LEAVE l;
+		END IF;
+
+		CALL itemShelvingSale_addBySale(vSaleFk, vSectorFk);
+	END LOOP;
+	CLOSE vSales;
+END$$
+DELIMITER ;
\ No newline at end of file
diff --git a/db/routines/vn/procedures/itemShelving_get.sql b/db/routines/vn/procedures/itemShelving_get.sql
index 1be762f09..d42446b06 100644
--- a/db/routines/vn/procedures/itemShelving_get.sql
+++ b/db/routines/vn/procedures/itemShelving_get.sql
@@ -16,7 +16,8 @@ BEGIN
 			ish.id,
 			s.priority,
 			ish.isChecked,
-			ic.url
+			ic.url,
+			ish.available
 		FROM itemShelving ish
 			JOIN item i ON i.id = ish.itemFk
 			JOIN shelving s ON vSelf = s.code COLLATE utf8_unicode_ci
diff --git a/db/routines/vn/triggers/itemShelving_beforeUpdate.sql b/db/routines/vn/triggers/itemShelving_beforeUpdate.sql
index 214c64b45..961d89f65 100644
--- a/db/routines/vn/triggers/itemShelving_beforeUpdate.sql
+++ b/db/routines/vn/triggers/itemShelving_beforeUpdate.sql
@@ -9,9 +9,5 @@ BEGIN
 		SET NEW.userFk = account.myUser_getId();
 	END IF;
 
-	IF (NEW.visible <> OLD.visible) THEN
-		SET NEW.available = GREATEST(NEW.available + NEW.visible - OLD.visible, 0);
-	END IF;
-
 END$$
 DELIMITER ;