## CR Summary: 3GPP TR 26.517 CR#0039 – OpenAPI YAML Corrections

**Document:** S4-260488, CR 0039, Category A (mirror correction), Rel-19, v19.1.0
**Source:** BBC | **WI:** 5MBP3

### What is being changed and why

- A `cancelled` property defined in the normative TS text for `ServiceScheduleDescription` was missing from the OpenAPI YAML in **Annex A.2.1** of TR 26.517.
- Without this fix, cancellation of MBS User Service Announcements is not implementable via the API.
- Tracked issue: https://github.com/5G-MAG/Standards/issues/200

### Technical Details

- **Affected spec/clause:** TR 26.517, Annex A.2.1 (`TS26517_MBSUserServiceAnnouncement.yaml`)
- **Schema modified:** `ServiceScheduleDescription`
- **Change:** Adds the missing `cancelled` property:
  ```yaml
  cancelled:
    type: boolean
    default: false
  ```
- Minor version bump in the YAML info block (2.2.1 → 2.2.2, copyright year updated).
- No other schemas or procedures are affected.

### Consequence if Not Approved

MBS User Service Announcement cancellation cannot be signalled via the OpenAPI interface, breaking a normatively specified feature.