When I create a Payable transaction, I add the supplier invoice # as the Reference.
Then...when I create a Withdrawal transaction, select PP as the line item, select the Payable Transaction that I want to attach to the Withdrawal, save and close to print my cheque.. I want to see the supplier invoice listed either as a Memo or Reference number.
When I send my cheque with stub to my supplier, they can easily see in the cheque stub which of their invoices to my that I am paying. Right now, it shows no reference for them (which I entered in the Payable transaction).