You can credit a created sales invoice by opening the request and then adjusting the sales rules. You can do this by taking the steps below:

  1. Open the Request
  2. Go to the Sales Rules tab
  3. Click on the sales line you want to credit and then choose Edit to adjust the number to the number to be invoiced. In this case it shouldn't have been billed yet so you can enter the number '0'.
  4. Coachview wants to invoice the total number, so Coachview says that the difference between 0 and 1 is the number of -1.
  5. Now you can create a new invoice in the invoices tab, in which it becomes a negative sales invoice or a credit invoice.

If you want to create a new invoice, you can do this by adjusting the sales rules to the correct number and create a new invoice here. If you want to invoice another debtor, add a new sales line to the request and change the debtor in the sales line.