## Events when custom metadata is removed

URL: https://docs.atlan.com/product/capabilities/build-apps/sdks/python/events/references/triggers/custom-metadata-delete

> Reference for custom metadata removal event triggers in the Atlan Python SDK (pyatlan). Understand BUSINESS_ATTRIBUTE_UPDATE events for event-driven integrations.

# Events when custom metadata is removed from asset

When custom metadata is removed from an [asset](https://docs.atlan.com/llms/platform/python/build-your-first-metadata-workflow/llms.txt) in Atlan, the following event is emitted.

## `BUSINESS_ATTRIBUTE_UPDATE`

Atlan always emits a [`BUSINESS_ATTRIBUTE_UPDATE`](https://docs.atlan.com/llms/platform/python/business-attribute-update/llms.txt) event when custom metadata is removed from an asset.

The `detail.message.mutatedDetails` object contains the details of the removed attributes. Any attributes with a value of `null` were removed.

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