SeekToPrimaryKey and NavigateToPrimaryKey do not appear to be working properly for compound primary keys. Looking at the source code I believe there is a bug in Private Function GetIndexOfPrimaryKey.

Private Function GetIndexOfPrimaryKey(ByVal ParamArray PrimaryKeyValues As Object()) As Integer

            '-- Establish locals

            Dim lnReturn As Integer = -1

            Dim lnCnt As Integer

            Dim loRow As DataRow

            Dim lcSelect As String = String.Empty

            '-- Make sure the length of the primary key values and the length of the fields matches

            If Me.PrimaryKeyFields.Length <> PrimaryKeyValues.Length Then

                Throw New ArgumentException("The number of PrimaryKeyValues passed must match the number of PrimaryKeyFields on the business object.")

            End If

            '-- Find the row

            Try

                '-- Create the primary key string

                For lnCnt = 0 To Me.PrimaryKeyFields.Length - 1

                    '-- Add the "AND" if necessary

                    If lnCnt > 0 Then

                        lcSelect &= " AND "

                    End If

                    '-- Add the select value

                    lcSelect = Me.PrimaryKeyFields(lnCnt) & "='" & PrimaryKeyValues(lnCnt).ToString() & "'"

                Next

When there is more than 1 primary key field, the previous value of lcSelect gets over written. Changing the statement under “‘—Add the select value”  to the following should fix the problem.

lcSelect = lcSelect & Me.PrimaryKeyFields(lnCnt) & "='" & PrimaryKeyValues(lnCnt).ToString() & "'"

-Larry