Here is how to reproduce:
1. Login to the web portal with a user that can decide an attestation step
2. Go to Attestation | Pending Attestation, open the sidesheet and via actions, delegate the step to another identity
3. Go to Attestation | Attestation History
4. Open sidesheet ("View Attestation Case Details") on the attestation where the decision was just delegated and click "Withdraw additional attestor"
5. Observe error as shown below:
Product Defect
Contact the Support Organization and ask for Hotfix #700238.
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