diff --git a/modules/ticket/back/methods/sale/specs/priceDifference.spec.js b/modules/ticket/back/methods/sale/specs/priceDifference.spec.js
index 0f1d2e4be7..7006833fc5 100644
--- a/modules/ticket/back/methods/sale/specs/priceDifference.spec.js
+++ b/modules/ticket/back/methods/sale/specs/priceDifference.spec.js
@@ -1,4 +1,5 @@
 const app = require('vn-loopback/server/server');
+let UserError = require('vn-loopback/util/user-error');
 
 describe('sale priceDifference()', () => {
     it('should return ticket price differences', async() => {
@@ -8,10 +9,28 @@ describe('sale priceDifference()', () => {
             agencyModeFk: 1,
             warehouseFk: 1
         };
-        let result = await app.models.Sale.priceDifference(1, data);
+        let result = await app.models.Sale.priceDifference(11, data);
 
-        expect(result.totalUnitPrice).toEqual(22.33);
-        expect(result.totalNewPrice).toEqual(22.27);
-        expect(result.totalDifference).toEqual(0.87);
+        expect(result.totalUnitPrice).toEqual(4.5);
+        expect(result.totalNewPrice).toEqual(4.24);
+        expect(result.totalDifference).toEqual(3.75);
+    });
+
+    it('should return an error if the ticket state is not valid for modifications', async() => {
+        let error;
+        let data = {
+            landed: new Date(),
+            addressFk: 121,
+            agencyModeFk: 1,
+            warehouseFk: 1
+        };
+        await app.models.Sale.priceDifference(1, data)
+            .catch(e => {
+                error = e;
+            });
+
+
+        expect(error).toEqual(new UserError(`The sales of this ticket can't be modified`));
     });
 });
+