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I was hired by a client for a job and finished it completely.He gave me 5 stars rating and ended the contract.I mistakenly clicked the "enable client to change feedback" button and there was no option to cancel it. The client cheated me and reduced the feedback score. So I request oDesk team to add an option to cancel if somebody clicks "enable client to change feedback" accidentally
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They probably need to have a message that appears. Something like 'are you sure that you want to enable the client to change feedback?' and then you can click 'yes' or 'no'.