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Typed Dataset Failed to enable constraints...

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Hello:

I am getting this error:
Code:

System.Data.ConstraintException: 'Failed to enable constraints. One or more rows contain values violating non-null, unique, or foreign-key constraints.'
On the following (red line is the error):

Code:

 
    Public DS As New PurchasingRequestDataSet

    Private Sub Updatedb_Request()
        Dim Status As String = CheckStatus()

        Dim RequestID As Integer = CInt(txtID.Text)

        Dim ta_MinRequestID As PurchasingRequestDataSetTableAdapters.PartsTableAdapter = New PurchasingRequestDataSetTableAdapters.PartsTableAdapter
        ta_MinRequestID.FillBy_MinRequestID(DS.Parts, RequestID)

        Dim MinDate As Date = ds.Parts.Rows(0)(1)

        Dim ta_Request As PurchasingRequestDataSetTableAdapters.RequestTableAdapter = New PurchasingRequestDataSetTableAdapters.RequestTableAdapter
        ta_Request.UpdateQuery(cboRequestor.Text.Trim, datDate1.Value, cboPriority.Text.Trim, MinDate, datExpectedDate.Value, "", Status, CInt(txtID.Text))

    End Sub


I feel like I have done this exact same logic several times. The only difference is I am looking at the minimum date ans passing that information through the variable MinDate.

The actual query works great!

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What am I missing here?

Thank you!
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