diff --git a/db/routines/vn/procedures/collection_new.sql b/db/routines/vn/procedures/collection_new.sql
index 782243c03..eef0cc9f6 100644
--- a/db/routines/vn/procedures/collection_new.sql
+++ b/db/routines/vn/procedures/collection_new.sql
@@ -12,30 +12,29 @@ BEGIN
 	DECLARE vLinesLimit INT;
 	DECLARE vTicketLines INT;
 	DECLARE vVolumeLimit DECIMAL;
-	DECLARE vTicketVolume DECIMAL;
 	DECLARE vSizeLimit INT;
+	DECLARE vTicketVolume DECIMAL;
 	DECLARE vMaxTickets INT;
-	DECLARE vStateFk VARCHAR(45);
+	DECLARE vStateCode VARCHAR(45);
 	DECLARE vFirstTicketFk INT;
-	DECLARE vHour INT;
-	DECLARE vMinute INT;
 	DECLARE vWorkerCode VARCHAR(3);
-	DECLARE vWagonCounter INT DEFAULT 0;
+	DECLARE vWagonCounter INT DEFAULT 1;
 	DECLARE vTicketFk INT;
 	DECLARE vItemPackingTypeFk VARCHAR(1);
-	DECLARE vHasAssignedTickets BOOLEAN;
+	DECLARE vHasAssignedTickets BOOL;
 	DECLARE vHasUniqueCollectionTime BOOL;
-	DECLARE vDone INT DEFAULT FALSE;
-	DECLARE vLockName VARCHAR(215);
-	DECLARE vLockTime INT DEFAULT 30;
+	DECLARE vHeight INT;
+	DECLARE vVolume INT;
+	DECLARE vLiters INT;
+	DECLARE vLines INT;
+	DECLARE vTotalLines INT DEFAULT 0;
+	DECLARE vTotalVolume INT DEFAULT 0;
 	DECLARE vFreeWagonFk INT;
-	DECLARE vErrorNumber INT;
-	DECLARE vErrorMsg TEXT;
+	DECLARE vDone INT DEFAULT FALSE;
 
-	DECLARE c1 CURSOR FOR
+	DECLARE vTickets CURSOR FOR
 		SELECT ticketFk, `lines`, m3
 			FROM tmp.productionBuffer
-			WHERE ticketFk <> vFirstTicketFk
 			ORDER BY HH,
 				mm,
 				productionOrder DESC,
@@ -48,26 +47,6 @@ BEGIN
 
 	DECLARE CONTINUE HANDLER FOR NOT FOUND SET vDone = TRUE;
 
-	DECLARE EXIT HANDLER FOR SQLEXCEPTION
-	BEGIN
-		GET DIAGNOSTICS CONDITION 1
-			vErrorNumber = MYSQL_ERRNO,
-			vErrorMsg = MESSAGE_TEXT;
-
-		CALL util.debugAdd('collection_new', JSON_OBJECT(
-				'errorNumber', vErrorNumber,
-				'errorMsg', vErrorMsg,
-				'lockName', vLockName,
-				'userFk', vUserFk,
-				'ticketFk', vTicketFk
-			)); -- Tmp
-
-		IF vLockName IS NOT NULL THEN
-			DO RELEASE_LOCK(vLockName);
-		END IF;
-		RESIGNAL;
-	END;
-
 	SELECT pc.ticketTrolleyMax * o.numberOfWagons,
 			pc.hasUniqueCollectionTime,
 			w.code,
@@ -78,36 +57,26 @@ BEGIN
 			o.trainFk,
 			o.linesLimit,
 			o.volumeLimit,
-			o.sizeLimit,
-			pc.collection_new_lockname
+			o.sizeLimit
 		INTO vMaxTickets,
-				vHasUniqueCollectionTime,
-				vWorkerCode,
-				vWarehouseFk,
-				vItemPackingTypeFk,
-				vStateFk,
-				vWagons,
-				vTrainFk,
-				vLinesLimit,
-				vVolumeLimit,
-				vSizeLimit,
-				vLockName
-		FROM productionConfig pc
-			JOIN worker w ON w.id = vUserFk
+			vHasUniqueCollectionTime,
+			vWorkerCode,
+			vWarehouseFk,
+			vItemPackingTypeFk,
+			vStateCode,
+			vWagons,
+			vTrainFk,
+			vLinesLimit,
+			vVolumeLimit,
+			vSizeLimit
+		FROM worker w
+			JOIN operator o ON o.workerFk = w.id 
 			JOIN state st ON st.`code` = 'ON_PREPARATION'
-			JOIN operator o ON o.workerFk = vUserFk;
-
-	SET vLockName = CONCAT_WS('/',
-		vLockName,
-		vWarehouseFk,
-		vItemPackingTypeFk
-	);
-
-	IF NOT GET_LOCK(vLockName, vLockTime) THEN
-		CALL util.throw(CONCAT('Cannot get lock: ', vLockName));
-	END IF;
+			JOIN productionConfig pc
+		WHERE w.id = vUserFk;
 
 	-- Se prepara el tren, con tantos vagones como sea necesario.
+
 	CREATE OR REPLACE TEMPORARY TABLE tTrain
 		(wagon INT,
 		shelve INT,
@@ -118,59 +87,58 @@ BEGIN
 		PRIMARY KEY(wagon, shelve))
 		ENGINE = MEMORY;
 
-	WHILE vWagons > vWagonCounter DO
-		SET vWagonCounter = vWagonCounter + 1;
-
-		INSERT INTO tTrain(wagon, shelve, liters, `lines`, height)
-			SELECT vWagonCounter, cv.`level` , cv.liters , cv.`lines` , cv.height
-				FROM collectionVolumetry cv
-				WHERE cv.trainFk = vTrainFk
+	INSERT INTO tTrain (wagon, shelve, liters, `lines`, height)
+		WITH RECURSIVE wagonSequence AS (
+		SELECT vWagonCounter wagon
+		UNION ALL
+		SELECT wagon + 1 wagon
+			FROM wagonSequence
+			WHERE wagon < vWagonCounter + vWagons -1
+		) 
+		SELECT ws.wagon, cv.`level`, cv.liters, cv.`lines`, cv.height
+			FROM wagonSequence ws
+				JOIN vn.collectionVolumetry cv ON cv.trainFk = vTrainFk
 					AND cv.itemPackingTypeFk = vItemPackingTypeFk;
-	END WHILE;
 
 	-- Esto desaparecerá cuando tengamos la table cache.ticket
+
 	CALL productionControl(vWarehouseFk, 0);
 
 	ALTER TABLE tmp.productionBuffer
 		ADD COLUMN liters INT,
 		ADD COLUMN height INT;
 
-	-- Se obtiene nº de colección.
-	INSERT INTO collection
-		SET itemPackingTypeFk = vItemPackingTypeFk,
-			trainFk = vTrainFk,
-			wagons = vWagons,
-			warehouseFk = vWarehouseFk;
-
-	SELECT LAST_INSERT_ID() INTO vCollectionFk;
-
 	-- Los tickets de recogida en Algemesí sólo se sacan si están asignados.
 	-- Los pedidos con riesgo no se sacan aunque se asignen.
-	DELETE pb.*
+
+	DELETE pb
 		FROM tmp.productionBuffer pb
 			JOIN state s ON s.id = pb.state
 		WHERE (pb.agency = 'REC_ALGEMESI'
 			AND s.code <> 'PICKER_DESIGNED')
 			OR pb.problem LIKE '%RIESGO%';
 
-	-- Comprobamos si hay tickets asignados. En ese caso, nos centramos
-	-- exclusivamente en esos tickets y los sacamos independientemente
-	-- de problemas o tamaños
-	SELECT COUNT(*) INTO vHasAssignedTickets
-		FROM tmp.productionBuffer pb
-			JOIN state s ON s.id = pb.state
-		WHERE s.code = 'PICKER_DESIGNED'
-			AND pb.workerCode = vWorkerCode;
+	-- Si hay tickets asignados, nos centramos exclusivamente en esos tickets 
+	-- y los sacamos independientemente de problemas o tamaños
+
+	SELECT EXISTS (
+		SELECT TRUE 
+			FROM tmp.productionBuffer pb
+				JOIN state s ON s.id = pb.state
+			WHERE s.code = 'PICKER_DESIGNED'
+				AND pb.workerCode = vWorkerCode
+		) INTO vHasAssignedTickets;
 
 	-- Se dejan en la tabla tmp.productionBuffer sólo aquellos tickets adecuados
+
 	IF vHasAssignedTickets THEN
-		DELETE pb.*
+		DELETE pb
 			FROM tmp.productionBuffer pb
 				JOIN state s ON s.id = pb.state
 			WHERE s.code <> 'PICKER_DESIGNED'
 				OR pb.workerCode <> vWorkerCode;
 	ELSE
-		DELETE pb.*
+		DELETE pb
 			FROM tmp.productionBuffer pb
 				JOIN state s ON s.id = pb.state
 				JOIN agencyMode am ON am.id = pb.agencyModeFk
@@ -193,13 +161,21 @@ BEGIN
 				OR (NOT pb.H AND pb.V > 0 AND vItemPackingTypeFk = 'H')
 				OR (NOT pb.V AND vItemPackingTypeFk = 'V')
 				OR (pc.isPreviousPreparationRequired AND pb.previousWithoutParking)
-				OR LENGTH(pb.problem) > 0
+				OR LENGTH(pb.problem)
 				OR pb.lines > vLinesLimit
 				OR pb.m3 > vVolumeLimit
 				OR sub.maxSize > vSizeLimit
 				OR pb.hasPlantTray;
 	END IF;
 
+	-- Hay que excluir aquellos que no tengan la misma hora de preparacion, si procede
+	IF vHasUniqueCollectionTime THEN
+		DELETE pb 
+			FROM tmp.productionBuffer pb
+				JOIN tmp.productionBuffer pb2 ON pb2.ticketFk = vFirstTicketFk
+					AND (pb.HH <> pb2.HH OR pb.mm <> pb2.mm);			
+	END IF;
+
 	SELECT ticketFk INTO vFirstTicketFk
 		FROM tmp.productionBuffer
 		ORDER BY HH, 
@@ -211,46 +187,38 @@ BEGIN
 			routeFk,
 			ticketFk
 		LIMIT 1;
-	
-	-- Hay que excluir aquellos que no tengan la misma hora de preparacion, si procede
-	IF vHasUniqueCollectionTime THEN
-		DELETE pb 
-			FROM tmp.productionBuffer pb
-				JOIN tmp.productionBuffer pb2 ON pb2.ticketFk = vFirstTicketFk
-					AND (pb.HH <> pb2.HH OR pb.mm <> pb2.mm);			
-	END IF;
 
-	SET vTicketFk = vFirstTicketFk;
-	SET @lines = 0;
-	SET @volume = 0;
-
-	OPEN c1;
-	read_loop: LOOP
+	OPEN vTickets;
+	l: LOOP
 		SET vDone = FALSE;
+		FETCH vTickets INTO vTicketFk, vTicketLines, vTicketVolume;
+
+		IF vDone THEN
+			LEAVE l;
+		END IF;
 
 		-- Buscamos un ticket que cumpla con los requisitos en el listado
-		IF ((vTicketLines + @lines) <= vLinesLimit OR vLinesLimit IS NULL)
-			AND ((vTicketVolume + @volume) <= vVolumeLimit OR vVolumeLimit IS NULL) THEN
+
+		IF (vLinesLimit IS NULL OR (vTotalLines + vTicketLines) <= vLinesLimit)
+			AND (vVolumeLimit IS NULL OR (vTotalVolume + vTicketVolume) <= vVolumeLimit) THEN
 
 			CALL ticket_splitItemPackingType(vTicketFk, vItemPackingTypeFk);
 			DROP TEMPORARY TABLE tmp.ticketIPT;
 
+			SELECT COUNT(*), SUM(litros), MAX(i.`size`), SUM(sv.volume)
+					INTO vLines, vLiters, vHeight, vVolume
+				FROM saleVolume sv
+					JOIN sale s ON s.id = sv.saleFk
+					JOIN item i ON i.id = s.itemFk
+				WHERE sv.ticketFk = vTicketFk;
+
+			SET vTotalVolume = vTotalVolume + vVolume,
+				vTotalLines = vTotalLines + vLines;
+
 			UPDATE tmp.productionBuffer pb
-					JOIN (
-						SELECT SUM(litros) liters,
-								@lines:= COUNT(*) + @lines,
-								COUNT(*) `lines`,
-								MAX(i.`size`) height,
-								@volume := SUM(sv.volume) + @volume,
-								SUM(sv.volume) volume
-							FROM saleVolume sv
-								JOIN sale s ON s.id = sv.saleFk
-								JOIN item i ON i.id = s.itemFk
-							WHERE sv.ticketFk = vTicketFk
-					) sub
-				SET pb.liters = sub.liters,
-					pb.`lines` = sub.`lines`,
-					pb.height = sub.height
+				SET pb.liters = vLiters,
+					pb.`lines` = vLines,
+					pb.height = vHeight
 				WHERE pb.ticketFk = vTicketFk;
 
 			UPDATE tTrain tt
@@ -267,17 +235,13 @@ BEGIN
 					tt.height
 				LIMIT 1;
 
-			-- Si no le encuentra una balda adecuada, intentamos darle un carro entero si queda alguno libre
+			-- Si no le encuentra una balda, intentamos darle un carro entero libre
+
 			IF NOT (SELECT COUNT(*) FROM tTrain WHERE ticketFk) THEN
-				SELECT tt.wagon
-					INTO vFreeWagonFk
-					FROM tTrain tt
-						LEFT JOIN (
-							SELECT DISTINCT wagon
-								FROM tTrain
-								WHERE ticketFk IS NOT NULL
-						) nn ON nn.wagon = tt.wagon
-					WHERE nn.wagon IS NULL
+				SELECT wagon INTO vFreeWagonFk
+					FROM tTrain
+					GROUP BY wagon
+					HAVING SUM(IFNULL(ticketFk, 0)) = 0
 					ORDER BY wagon
 					LIMIT 1;
 
@@ -286,38 +250,35 @@ BEGIN
 						SET ticketFk = vFirstTicketFk
 						WHERE wagon = vFreeWagonFk;
 
-					-- Se anulan el resto de carros libres para que sólo uno lleve un pedido excesivo
-					DELETE tt.*
-						FROM tTrain tt
-							LEFT JOIN (
-								SELECT DISTINCT wagon
-									FROM tTrain
-									WHERE ticketFk IS NOT NULL
-							) nn ON nn.wagon = tt.wagon
-						WHERE nn.wagon IS NULL;
-				END IF;
-			END IF;
+					-- Se anulan el resto de carros libres, 
+					-- máximo un carro con pedido excesivo
 
-			FETCH c1 INTO vTicketFk, vTicketLines, vTicketVolume;
-			IF vDone OR NOT (SELECT COUNT(*) FROM tTrain WHERE ticketFk IS NULL) THEN
-				LEAVE read_loop;
-			END IF;
-		ELSE
-			FETCH c1 INTO vTicketFk, vTicketLines, vTicketVolume;
-			IF vDone THEN
-				LEAVE read_loop;
-			END IF;
+					DELETE tt
+						FROM tTrain tt
+							JOIN (SELECT wagon
+								FROM tTrain
+								GROUP BY wagon
+								HAVING SUM(IFNULL(ticketFk, 0)) = 0
+							) sub ON sub.wagon = tt.wagon;
+				END IF;
+			END IF;	
 		END IF;
 	END LOOP;
-	CLOSE c1;
+	CLOSE vTickets;
 
 	IF (SELECT COUNT(*) FROM tTrain WHERE ticketFk) THEN
-		UPDATE collection c
-				JOIN state st ON st.code = 'ON_PREPARATION'
-			SET c.stateFk = st.id
-			WHERE c.id = vCollectionFk;
+		-- Se obtiene nº de colección
+
+		INSERT INTO collection
+			SET itemPackingTypeFk = vItemPackingTypeFk,
+				trainFk = vTrainFk,
+				wagons = vWagons,
+				warehouseFk = vWarehouseFk;
+
+		SELECT LAST_INSERT_ID() INTO vCollectionFk;
 
 		-- Asigna las bandejas
+
 		INSERT IGNORE INTO ticketCollection(ticketFk, collectionFk, `level`, wagon, liters)
 			SELECT tt.ticketFk, vCollectionFk, tt.shelve, tt.wagon, tt.liters
 				FROM tTrain tt
@@ -325,37 +286,34 @@ BEGIN
 				ORDER BY tt.wagon, tt.shelve;
 
 		-- Actualiza el estado de los tickets
-		CALL collection_setState(vCollectionFk, vStateFk);
+
+		CALL collection_setState(vCollectionFk, vStateCode);
 
 		-- Aviso para la preparacion previa
+		
 		INSERT INTO ticketDown(ticketFk, collectionFk)
 			SELECT tc.ticketFk, tc.collectionFk
 				FROM ticketCollection tc
 				WHERE tc.collectionFk = vCollectionFk;
 
-		CALL sales_mergeByCollection(vCollectionFk);
+		CALL collection_mergeSales(vCollectionFk);
 
 		UPDATE `collection` c
-				JOIN (
+				JOIN(
 					SELECT COUNT(*) saleTotalCount,
 							SUM(s.isPicked <> 0) salePickedCount
 						FROM ticketCollection tc
 							JOIN sale s ON s.ticketFk = tc.ticketFk
-							WHERE tc.collectionFk = vCollectionFk
-								AND s.quantity > 0
-				) sub
+						WHERE tc.collectionFk = vCollectionFk
+							AND s.quantity > 0
+				)sub
 			SET c.saleTotalCount = sub.saleTotalCount,
 				c.salePickedCount = sub.salePickedCount
 			WHERE c.id = vCollectionFk;
-
 	ELSE
-		DELETE FROM `collection`
-			WHERE id = vCollectionFk;
-			SET vCollectionFk = NULL;
+		SET vCollectionFk = NULL;
 	END IF;
 
-	DO RELEASE_LOCK(vLockName);
-
 	DROP TEMPORARY TABLE
 		tTrain,
 		tmp.productionBuffer;
diff --git a/db/routines/vn/procedures/ticket_mergeSales.sql b/db/routines/vn/procedures/ticket_mergeSales.sql
index 28b2dc1c0..2dc3a39da 100644
--- a/db/routines/vn/procedures/ticket_mergeSales.sql
+++ b/db/routines/vn/procedures/ticket_mergeSales.sql
@@ -3,41 +3,47 @@ CREATE OR REPLACE DEFINER=`root`@`localhost` PROCEDURE `vn`.`ticket_mergeSales`(
 	vSelf INT
 )
 BEGIN
+	DECLARE vHasSalesToMerge BOOL;
 	DECLARE EXIT HANDLER FOR SQLEXCEPTION
 	BEGIN
 		ROLLBACK;
 		RESIGNAL;
 	END;
 
+	START TRANSACTION;
+
+	SELECT id INTO vSelf
+		FROM ticket
+		WHERE id = vSelf FOR UPDATE;
+
 	CREATE OR REPLACE TEMPORARY TABLE tSalesToPreserve
 		(PRIMARY KEY (id))
 		ENGINE = MEMORY
-		SELECT s.id, s.itemFk, SUM(s.quantity) newQuantity
+		SELECT s.id, s.itemFk, SUM(s.quantity) newQuantity 
 			FROM sale s
 				JOIN item i ON i.id = s.itemFk
 				JOIN itemType it ON it.id = i.typeFk
 			WHERE s.ticketFk = vSelf
 				AND it.isMergeable
-			GROUP BY s.itemFk, s.price, s.discount;
+			GROUP BY s.itemFk, s.price, s.discount
+			HAVING COUNT(*) > 1;
 
-	START TRANSACTION;
+	SELECT COUNT(*) INTO vHasSalesToMerge
+	 	FROM tSalesToPreserve;
 
-	UPDATE sale s 
-			JOIN tSalesToPreserve stp ON stp.id = s.id
-		SET s.quantity = newQuantity
-		WHERE s.ticketFk = vSelf;
+	IF vHasSalesToMerge THEN 
+		UPDATE sale s 
+				JOIN tSalesToPreserve stp ON stp.id = s.id
+			SET s.quantity = newQuantity;
 
-	DELETE s.*
-		FROM sale s
-			LEFT JOIN tSalesToPreserve stp ON stp.id = s.id
-			JOIN item i ON i.id = s.itemFk
-			JOIN itemType it ON it.id = i.typeFk
-		WHERE s.ticketFk = vSelf
-			AND stp.id IS NULL
-			AND it.isMergeable;
+		DELETE s
+			FROM sale s
+				JOIN tSalesToPreserve stp ON stp.itemFk = s.itemFk
+			WHERE s.ticketFk = vSelf
+				AND s.id <> stp.id;
+	END IF;
 
 	COMMIT;
-
 	DROP TEMPORARY TABLE tSalesToPreserve;
 END$$
 DELIMITER ;