How to make the record editable which is made readonly by BC readonly Userpropery

Hi

We have a requirement to make the record read only when the status is "Canceled" . So I have created a Calculated Field to check if the status is "Canceled" and a BC Readonly user property based on the calculated Field.

we have another requirement on click of "Amend" Button we need the change the "Canceled" status record to "Open" Status and record should be editable now. So on button click I tried to activate the SetAdminMode as TRUE and set the calculated field to "N", but getting a error message like "This operation is not available for read only field".  Can you please help to provide solution to resovle this issue.