Avoid duplicate entries in a table [Solved]

Avoid duplicate entries in a table

We use a table to enter all of our A/P invoices.  Is there a way to avoid entering an invoice twice by searching the cells above for the duplicate number for that vendor?  The vendor's name is entered in one column, the invoice # is entered in a different
column
Thanks for any help!

Anwsers to the Problem Avoid duplicate entries in a table

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You will need a macro to prevent any duplicates from being entered into your invoice table.
Assuming that invoice numbers are unique, i.e.
different vendors do not use the same numbers, try this macro:
Right click on the worksheet tab and select "View Code".
Enter the below macro in the top right window.
Private Sub Worksheet_Change(ByVal Target As Range)
  Set firstinvoice = Range("C2")
  If Not Intersect(Target, firstinvoice.EntireColumn) Is Nothing Then
    If Target.row > firstinvoice.row Then
      If WorksheetFunction.CountIf(firstinvoice.Resize(Target.row - firstinvoice.row), Target.Value) > 0 Then
        MsgBox "Invoice number " & Target.Value & " is already entered", vbOKOnly + vbCritical, "Invalid entry"
        Target.Value = ""
      End If
    End If
  End If
End Sub
Change the "C2" to the cell where your first invoice number is.
Hope this helps / Lars-Åke

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