Changing the requester in the RfC does not work

Dear Experts,

We have a scenario with our client, where a resource who raised a Request for Change (RfC) left the company and is replaced by another employee.

Now, there is a request pending on Old resource which needs to be completed.

I Changed the requester name in the RfC and the change worked successfully. The tricky part here is that the requester is also one of the approvers for the RFC (RFC has 3 level approval procedure).  One more thing that I want to mention here is that, the status of the RfC was in "To be approved" status when I changed the Requester name.

Now when the new requester logs into the RfC and tries to approve the RfC, the user gets an error "Approval must be made by assigned business Partner".

I somehow feel, that the change of requester is still not reflected in the backend. But the logs in CRM_UI show no error messages.

Kindly help me how to fix the issue.

Thanks,

Bharath