Compensation API - Salary Type rejected

We're trying to write the "new" salary type (13.+14. Gehalt) via the compensation API but the type-id (019c03e0-d08e-a061-f800-d12cd2e0f87a) gets rejected - but the same type is writeable (and written - we migrated ALL employees) via the web-interface.

Now our API-integration is broken since we cannot update compensations anymore - how can we write that type?