diff --git a/back/methods/collection/setSaleQuantity.js b/back/methods/collection/setSaleQuantity.js
index 82451b8be1..644c44a609 100644
--- a/back/methods/collection/setSaleQuantity.js
+++ b/back/methods/collection/setSaleQuantity.js
@@ -1,5 +1,5 @@
 module.exports = Self => {
-    Self.remoteMethodCtx('setSaleQuantity', {
+    Self.remoteMethod('setSaleQuantity', {
         description: 'Update sale quantity',
         accessType: 'WRITE',
         accepts: [{
@@ -24,11 +24,13 @@ module.exports = Self => {
         }
     });
 
-    Self.setSaleQuantity = async ctx => {
-        const args = ctx.args;
+    Self.setSaleQuantity = async(saleId, quantity) => {
         const models = Self.app.models;
 
-        const sale = await models.Sale.findById(args.saleId,);
-        return await sale.updateAttribute('quantity', args.quantity);
+        const sale = await models.Sale.findById(saleId);
+        return await sale.updateAttributes({
+            originalQuantity: sale.quantity,
+            quantity: quantity
+        });
     };
 };
diff --git a/back/methods/collection/spec/setSaleQuantity.spec.js b/back/methods/collection/spec/setSaleQuantity.spec.js
index 4e3c8c4aad..5d06a43834 100644
--- a/back/methods/collection/spec/setSaleQuantity.spec.js
+++ b/back/methods/collection/spec/setSaleQuantity.spec.js
@@ -5,19 +5,12 @@ describe('setSaleQuantity()', () => {
         const saleId = 30;
         const newQuantity = 10;
 
-        const ctx = {
-            args: {
-                saleId: saleId,
-                quantity: newQuantity
-            }
-        };
-
         const originalSale = await models.Sale.findById(saleId);
 
-        await models.Collection.setSaleQuantity(ctx);
+        await models.Collection.setSaleQuantity(saleId, newQuantity);
         const updateSale = await models.Sale.findById(saleId);
 
-        expect(updateSale.quantity).toBeLessThan(originalSale.quantity);
+        expect(updateSale.originalQuantity).toEqual(originalSale.quantity);
         expect(updateSale.quantity).toEqual(newQuantity);
     });
 });
diff --git a/modules/ticket/back/models/sale.json b/modules/ticket/back/models/sale.json
index 767a3e59e1..14a6bc2cfd 100644
--- a/modules/ticket/back/models/sale.json
+++ b/modules/ticket/back/models/sale.json
@@ -14,7 +14,7 @@
     "properties": {
         "id": {
             "id": true,
-            "type": "Number",
+            "type": "number",
             "description": "Identifier"
         },
         "concept": {
@@ -22,22 +22,25 @@
             "required": true
         },
         "quantity": {
-            "type": "Number"
+            "type": "number"
         },
         "price": {
-            "type": "Number"
+            "type": "number"
         },
         "discount": {
-            "type": "Number"
+            "type": "number"
         },
         "reserved": {
             "type": "boolean"
         },
         "isPicked": {
-            "type": "Number"
+            "type": "number"
         },
         "created": {
             "type": "date"
+        },
+        "originalQuantity":{
+            "type": "number"
         }
     },
     "relations": {