# E01028 — ResourceInUse

This resource is still in use by other resources and cannot be deleted.

- **HTTP status**: `409`
- **Type**: `conflict_error`
- **Name**: `ResourceInUse`

## What to do

Remove or reassign the resources that still reference this one, then retry the delete.

## Related

- [Idempotency](/docs/api/idempotency): safe retries and key reuse rules
- [E01xxx — Infrastructure](/docs/api/errors/E01xxx): every code in this range
- [Errors](/docs/api/errors): the full wire contract, status mapping, and error catalog
- [Error handling](/docs/guides/errors): branching on `type` and `code`, validation details, and `vendor_code`