diff --git a/back/methods/collection/spec/updateCollectionSale.spec.js b/back/methods/collection/spec/updateCollectionSale.spec.js
index 2f150aba9..83b161a73 100644
--- a/back/methods/collection/spec/updateCollectionSale.spec.js
+++ b/back/methods/collection/spec/updateCollectionSale.spec.js
@@ -1,13 +1,62 @@
 const app = require('vn-loopback/server/server');
 
-// #2495 updateCollectionSale reparar polución de unitarios
-xdescribe('updateCollectionSale()', () => {
-    it('return a new collection', async() => {
+describe('updateCollectionSale()', () => {
+    it('should return a new collection', async() => {
+        const sectorOneWarehouseID = 1;
         let ctx = {req: {accessToken: {userId: 106}}};
-        let response = await app.models.Collection.updateCollectionSale(ctx, 1, 5, 5, 5, 1, 4, false, 'UXN', 1, 1);
+        ctx.args = {
+            sale: 1,
+            originalQuantity: 5,
+            quantity: 5,
+            quantityPicked: 5,
+            ticketFk: 1,
+            stateFk: 4,
+            isNicho: false,
+            shelvingFk: 'UXN',
+            itemFk: 1,
+            sectorFk: 1
+        };
+        let originalSaleTracking = await app.models.SaleTracking.findOne({
+            where: {
+                saleFk: ctx.args.sale,
+                stateFk: ctx.args.stateFk
+            }
+        });
+        let itemPlacement = await app.models.ItemPlacement.findOne({
+            where: {
+                itemFk: ctx.args.itemFk,
+                warehouseFk: sectorOneWarehouseID
+            }
+        });
+        const originalSale = await app.models.Sale.findById(ctx.args.sale);
+        const originalItemShelving = await app.models.ItemShelving.findOne({where: {shelvingFk: ctx.args.shelvingFk, itemFk: ctx.args.itemFk}});
+        const originalTicketLastState = await app.models.TicketLastState.findById(ctx.args.ticketFk);
+
+        let response = await app.models.Collection.updateCollectionSale(ctx);
 
         expect(response.length).toBeGreaterThan(0);
         expect(response[0][0].id).toEqual(1);
         expect(response[0][0].quantity).toEqual(5);
+
+        // restores
+        if (originalSaleTracking)
+            await originalSaleTracking.save();
+        else {
+            originalSaleTracking = await app.models.SaleTracking.findOne({
+                where: {
+                    saleFk: ctx.args.sale,
+                    stateFk: ctx.args.stateFk
+                }
+            });
+            await originalSaleTracking.destroy();
+        }
+        await originalSale.save();
+        const itemShelvingsToDestroy = await app.models.ItemShelving.find({where: {shelvingFk: ctx.args.shelvingFk, itemFk: ctx.args.itemFk}});
+        for (itemShelving of itemShelvingsToDestroy)
+            await itemShelving.destroy();
+
+        await originalItemShelving.save();
+        await originalTicketLastState.save();
+        await itemPlacement.save();
     });
 });
diff --git a/back/methods/collection/updateCollectionSale.js b/back/methods/collection/updateCollectionSale.js
index 01575c972..608250d18 100644
--- a/back/methods/collection/updateCollectionSale.js
+++ b/back/methods/collection/updateCollectionSale.js
@@ -65,25 +65,26 @@ module.exports = Self => {
         }
     });
 
-    Self.updateCollectionSale = async(ctx, sale, originalQuantity, quantity, quantityPicked, ticketFk, stateFk, isNicho, shelvingFk, itemFk, sectorFk) => {
+    Self.updateCollectionSale = async ctx => {
         const userId = ctx.req.accessToken.userId;
+        const args = ctx.args;
 
-        if (originalQuantity == quantity) {
+        if (args.originalQuantity == args.quantity) {
             query = `CALL vn.collection_updateSale(?,?,?,?,?)`;
-            await Self.rawSql(query, [sale, originalQuantity, userId, stateFk, ticketFk]);
+            await Self.rawSql(query, [args.sale, args.originalQuantity, userId, args.stateFk, args.ticketFk]);
         }
 
-        if (!isNicho) {
+        if (!args.isNicho) {
             query = `CALL vn.collection_faults(?,?,?)`;
-            await Self.rawSql(query, [shelvingFk, quantityPicked, itemFk]);
+            await Self.rawSql(query, [args.shelvingFk, args.quantityPicked, args.itemFk]);
         } else {
             query = `CALL vn.sector_getWarehouse(?)`;
-            const [result] = await Self.rawSql(query, [sectorFk]);
+            const [result] = await Self.rawSql(query, [args.sectorFk]);
 
             query = `CALL vn.itemPlacementSave(?,?,?)`;
-            await Self.rawSql(query, [shelvingFk, quantityPicked, result[0]['warehouseFk']]);
+            await Self.rawSql(query, [args.shelvingFk, args.quantityPicked, result[0]['warehouseFk']]);
         }
         query = `CALL vn.sale_updateOriginalQuantity(?,?)`;
-        return await Self.rawSql(query, [sale, quantity]);
+        return await Self.rawSql(query, [args.sale, args.quantity]);
     };
 };
diff --git a/modules/item/back/models/item-placement.json b/modules/item/back/models/item-placement.json
index c2d779fcd..7bbb2dc91 100644
--- a/modules/item/back/models/item-placement.json
+++ b/modules/item/back/models/item-placement.json
@@ -7,8 +7,18 @@
         }
     },
     "properties": {
+        "id": {
+            "type": "Number",
+            "id": true
+        },
         "code": {
             "type": "String"
+        },
+        "itemFk": {
+            "type": "Number"
+        },
+        "warehouseFk": {
+            "type": "Number"
         }
     },
     "relations": {
diff --git a/modules/item/back/models/item-shelving.json b/modules/item/back/models/item-shelving.json
index 0fcc00f7e..f0391c565 100644
--- a/modules/item/back/models/item-shelving.json
+++ b/modules/item/back/models/item-shelving.json
@@ -8,18 +8,24 @@
 	},
 	"properties": {
 		"id": {
-			"type": "number",
+			"type": "Number",
 			"id": true,
 			"description": "Identifier"
 		},
 		"shelve": {
-			"type": "string"
+			"type": "String"
+        },
+		"shelvingFk": {
+			"type": "String"
+        },
+		"itemFk": {
+			"type": "Number"
         },
         "deep": {
-			"type": "number"
+			"type": "Number"
         },
         "quantity": {
-			"type": "number"
+			"type": "Number"
 		},
 		"created": {
 			"type": "Date"
diff --git a/modules/ticket/back/models/sale-tracking.json b/modules/ticket/back/models/sale-tracking.json
index 7936f827f..43b0df160 100644
--- a/modules/ticket/back/models/sale-tracking.json
+++ b/modules/ticket/back/models/sale-tracking.json
@@ -12,6 +12,12 @@
             "type": "Number",
             "forceId": false
         },
+        "saleFk": {
+            "type": "Number"
+        },
+        "stateFk": {
+            "type": "Number"
+        },
         "isChecked": {
             "type": "boolean"
         },
diff --git a/modules/ticket/back/models/ticket-tracking.json b/modules/ticket/back/models/ticket-tracking.json
index 550df7d9c..c2c365013 100644
--- a/modules/ticket/back/models/ticket-tracking.json
+++ b/modules/ticket/back/models/ticket-tracking.json
@@ -5,22 +5,30 @@
         "model": "TicketLog",
         "relation": "ticket",
         "showField": "stateFk"
-    },
-    "options": {
-        "mysql": {
-            "table": "ticketTracking"
-        }
-    },
+        },
+        "options": {
+            "mysql": {
+                "table": "ticketTracking"
+            }
+        },
     "properties": {
-      "id": {
-            "id": true,
-            "type": "Number",
-            "forceId": false
-      },
-      "created": {
-            "type": "Date",
-            "required": false
-      }
+        "id": {
+                "id": true,
+                "type": "Number",
+                "forceId": false
+        },
+        "created": {
+                "type": "Date"
+        },
+        "ticketFk": {
+                "type": "Number"
+        },
+        "stateFk": {
+                "type": "Number"
+        },
+        "workerFk": {
+                "type": "Number"
+        }
     },
     "relations": {
         "ticket": {