The Area being Modelled is :-
Things I buy and sell on eBay.

I need a Database to maintain all my sales and purchases on eBay.
This includes items I have bought locally, on ebay, and/or sell on consignment.
I'd like to print a report for myself or my consignment people to attach receipts and such to. 
But my model is missing something somewhere. I think in the deliveries, sources, and listing tables. 
Any suggestions?


A. DESIGN NOTES :
A.1 The Detail reflects the Requirements.

B. The Things of Interest, ('THINGS'), include :-
B.1 Items bought or sold
B.2 Purchases
B.2 Sales.

C. These THINGS are Related as follows :-
C.1 A PURCHASE consists of just one ITEM.
C.2 A SALE consists of just one ITEM.

D. Other Characteristics of these THINGS include :-
D.1 

E. Sample Data includes :-
E.1 To be determined

F. Typical Enquiries include :-
F.1 To be Determined