Dim nInvValue As Double
  Dim nCreditValue As Double

  For Each oReferenceItem In oMatchInvoices
     Dim nUnallocated As Double = oReferenceItem.DocumentOutstandingValue - oReferenceItem.DocumentAllocatedValue
     If ((nUnallocated <> 0) And (sReferenceValue = oReferenceItem.InstrumentNo)) Then
        iCount = iCount + 1
        If (oReferenceItem.IsDebit) And (nUnallocated > 0) Then
           nInvValue = nInvValue + nUnallocated
           InvoiceList.Add(nUnallocated.ToString("c"), oReferenceItem.URN.ToString)
        End If
        If (oReferenceItem.IsCredit) And (nUnallocated < 0) Then
           nCreditValue = nCreditValue - nUnallocated
           CreditList.Add(nUnallocated.ToString("c"), oReferenceItem.URN.ToString)
        End If
     End If
  Next