Fail POST record using Provider OLE DB for Visual Foxpro

I used Delphi 6 and wanna try to develop the existing database (Visual
FP). I used provider OLE DB Provider for Visual FoxPRO. Connection is
no problem but when I try to update the record and posting the error
just coming
'Multiple-Step operation genrated errors'.

but if I using ACCESS database everything is ok.

thanks..