# HubSpot for Developers Breaking Change: Pipeline and pipeline stage delete endpoints will validate references by default starting with the 2026-09 API version

- Product: HubSpot for Developers (https://whatsnew.fyi/product/hubspot-developers)
- Vendor: HubSpot
- Date: 2026-07-21
- Original notes: https://developers.hubspot.com/changelog/pipeline-stage-validation-true
- Permalink: https://whatsnew.fyi/product/hubspot-developers/releases/2026-07-21-breaking-change-pipeline-and-pipeline-stage-delet

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7/23/2026 Edit - The post has been updated to include the Deal object specific validateDealStageUsagesBeforeDelete query parameter. Availability: This is a breaking change for the next GA date-based A…

- **changed** — Pipeline and pipeline stage delete endpoints will validate references by default starting with the 2026-09 API version
- **added** — Deal object now supports validateDealStageUsagesBeforeDelete query parameter