To remove an Advance Payment on an Invoice, head over to the Main Card, Invoices-view, under the Drafts section.
The invoice must be in draft-state, otherwise, it will not be possible to remove an advance payment.
Hover your mouse cursor over the invoice and click on it to open the invoice.
Once you are in the invoice, click on Adjustments.
The following dialogue will appear.
Hover your mouse cursor over the advance payment until the small Delete button appears.
Click on the Delete button.
The following dialogue will appear, click on the OK button to confirm.
Click on the Save Changes button if you wish to continue working on the invoice.
Or click on the Approve button to approve the invoice.
Note:
1. Ensure that you are a Client Manager, a Case Manager, or a User with 'Accounting'-rights setup to be able to remove Advance Payment on invoices.