## CR 26.517 CR#0037 – OpenAPI YAML Corrections (5MBP3)

**Document:** S4-260486, CR 0037 to TR 26.517 v17.9.1, Category F (correction), Rel-17

**Problem:** The `cancelled` property defined in the normative TS for `ServiceScheduleDescription` was missing from the OpenAPI YAML schema in Annex A.2.1, making it impossible to signal cancellation of MBS User Service Announcements.

**Change:** Adds the missing `cancelled` boolean property (with `default: false`) to the `ServiceScheduleDescription` schema object in the `TS26517_MBSUserServiceAnnouncement.yaml` OpenAPI definition.

**Affected clause:** A.2.1 (MBS User Service Announcement schema)

**Impact:** Without this fix, implementations cannot use the OpenAPI-generated code/schema to cancel MBS User Service Announcements, breaking a normatively specified feature.

**No other specs affected** (test specs, O&M, other core specs marked not affected).