Record a payment on an invoice

Open the finalized invoice. The Payments section shows the Gross amount, what is still Open and the payments recorded so far.
Type the amount the customer paid. With Enter the open amount you fill in the rest in one click.
Set the Payment date and choose the Kind: for example Cash or Transfer, entered by hand. A payment that arrives on your bank statement is not entered here by hand.
To settle a small rest, Cash discount, Bank fee or Written off closes the remaining amount, and the VAT is corrected where the law requires it. A short hint appears under the kind. Written off is offered only to firm owners and firm admins, and it asks for a Reason for the write-off from a fixed list; the reason "Other (explain in the note)" also needs the Note. Every other role does not see Written off: ask an owner or admin.
Add a Note if you like and choose Record payment. The status changes to Partly paid or Paid.
A wrong entry is not deleted. Use the undo icon next to it and confirm with Really reverse, which adds a reversal row.