Yassin,

>I am registering the object manually
>
> Dim oOSPCHECKBOOKSETUP As New OSPCHECKBOOKSETUP
> oOSPCHECKBOOKSETUP.Entity.INTERID = Me.BvinField.Value
> oOSPCHECKBOOKSETUP.Entity.CHEKBKID = Me.CheckBookList.SelectedValue
> oOSPCHECKBOOKSETUP.Entity.MODIFIDT = Now.Date
>
> Dim save1 As OakLeaf.MM.Main.Business.mmSaveDataResult =
> oOSPCHECKBOOKSETUP.SaveEntity
>

Try calling oOSPCHECKBOOKSETUP.NewEntity() before trying to set entity properties.

Best Regards,