---
title: Service API version 4 breaking changes
slug: commerce-connect-15/service-api/service-api-4
docTags: 
createdAt: 2026-07-22T14:38:28.000Z
---

Service API version 4.0 contains breaking changes compared to the previous version, 3.x. These breaking changes require code changes in website implementations depending on Service API.

- It is no longer allowed to change the content meta-class. In ServiceAPI 4.0, if you try to change the meta-class of an entry or a node, the following exception is thrown: **MetaClass could not be changed**.
- `_ExcludedCatalogEntryMarkets` is now exposed to the `MetaFields` collection.