Performance Management - Ehp4

I try to complete appraisal document. When I try to move the document to "Complete" status I keep getting the error

"Appraisal date is earlier than earliest appraisal date".

Long text is not available for the error. I do not make any customizing for the date. My customer tester get same error no.

What is the problem? Please assist me.

Thank you.

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