Is there a different table for posted and unposted payable's invoices?

Okay, so I recently coded something to check the PmPaidTransactionHistTable to ensure that there were no duplicates and ran into an issue due to the fact that unposted transactions which were still in "work" were not checked. So I'm wondeirng if there's a different table for those invoices. Here is my code btw,

Dim CustomerMasterTableID As PmPaidTransactionHistTable
        Dim CustomerMasterInvoiceVendor As PmPaidTransactionHistTable
        Dim TabErr As TableError
        Dim VendErr As TableError
        CustomerMasterTableID = Dynamics.Tables.PmPaidTransactionHist
        CustomerMasterInvoiceVendor = Dynamics.Tables.PmPaidTransactionHist
        ' Find the proper keys
        CustomerMasterInvoiceVendor.Key = 1
        CustomerMasterTableID.Key = 3
        ' Used Vendor and Invoice to symbolize the two variables that I was looking for; vendorname and invoicenumber.
        CustomerMasterTableID.DocumentNumber.Value = invoice
        CustomerMasterInvoiceVendor.VendorId.Value = VendorId
        'Retriving the error
        TabErr = CustomerMasterTableID.Get()
        VendErr = CustomerMasterInvoiceVendor.Get()
        If TabErr = TableError.NoError And VendErr = TableError.NoError Then
            Error 123
        Else

        End If
        CustomerMasterInvoiceVendor.Close()
        CustomerMasterTableID.Close()