After you have received the money you have to put the catering sales as paid.

Here's how you do this: 

1.  Tick the "Payment completed" option after you have chosen the catering.

2.  Save it and a contract number will appear at the top left. Top right you can see that the status
of the contract is Final and that the installments have been set up.

3. In the catering tab you get an overview of the number of menus ordered through the catering sales.

4. At the tab of the installments you can see that the payment is complete.