The purpose of the Deal Mapper tool is to match records. The Mapper a board on which you can organize deal and corresponding invoices.
On the left, you can add items to the desk from a list of Deals. Click "Fill Vouchers", and the application will auto-match any existing and auto-generate any non-existing invoices.
On the right, you can add records of money moving in and out of your accounts, bills and invoices, that make up a Deal. Click "Fill Deals", and the application will auto-match any existing and auto-generate any non-existing deals.
Connect vouchers and deals, hit Save Changes, and you have mapped a Deal with the Deal Mapper! Your accountant will thank you.