When you issue a credit note for a client invoice, the amount comes from that
invoice's issued figures. A full credit includes the invoice's discount. Partial
credits cannot add up to more than the original invoice, even if two staff
members submit at the same time. Retrying the same submission after an uncertain
response checks the original credit note.

For a partial credit, enter the amount after any invoice discount and before VAT.
The issued invoice supplies the VAT basis and caps the total credit.

If an invoice combines different VAT rates, a partial credit asks for financial
review until a per-rate tax breakdown is available. A full credit can still
reverse the issued invoice's exact total and VAT. This rule applies to every
venue that uses client invoices.

If a credit-note response is interrupted, the original request is kept in the current browser tab. Reopening the dialog or refreshing that tab resumes the same request; amounts remain locked until the result is confirmed. Switch back to the original staff account and venue to continue. A definitive validation refusal lets staff correct the form. Closing a tab or using a different device still requires checking the invoice's credit history before starting another request.