Performance Document - Employee choose Manager

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Hi Team,

A client asked us that He would like that the employee will choose the manager who evaluates him. This because during the year, the employee changes many project managers and it could be very hard to track all of them as project manager.

Is there a way we can do that?

Our Idea was to track with ERP project, the project manager he worked more and than with a report sent to the employee, ask him to transfer the performance document to that manager.

What is your idea? How can we do that?

Thanks,

G