I can't update the duedate and startdate fields with dtw

Hİ, I can't update the duedate and startdate fields with dtw successful production orders. I get the mistake "Start day indispensable beryllium aboriginal than, oregon the aforesaid as, the papers commencement day [WOR4.StartDate][line: 1]65171" regarding the startdate field. but the day I entered is already aboriginal than the commencement day field. When I participate a erstwhile date, determination is nary problem. Can you help?