I feel your pain and I figured out how to do it.  After you have created and printed the cheque, go to the supplier you paid and click on Transaction List.  You should see the Bill Payment (cheque) for the cheque you just created.  Click on it.  Then at the bottom of the page click on Print or Preview.  Click on Print Remittance Slip - and this is basically the exact same thing as a Bill Payment Stub and will display all the items you paid on the cheque.  You can print and send it with your cheque.