CII-SR-484: The amount already paid may appear only once

What it means

The totals section (SpecifiedTradeSettlementHeaderMonetarySummation) holds the paid amount (BT-113), the sum of what has been paid before the invoice is issued, such as a deposit or an advance payment. In the file it is the element TotalPrepaidAmount, and the check allows it at most once.

Why it matters

This figure is deducted from the invoice total to give the amount due. With two values the recipient cannot tell how much has been paid, so the amount due is in doubt. This is a fatal error and the invoice is rejected.

How to fix it

Check how much has already been paid on this invoice, such as a deposit or an advance payment, and make sure it appears once in the totals. Export the invoice again from your invoicing software. If you edit the XML yourself, delete the extra TotalPrepaidAmount and keep the one that equals everything paid in advance.

The rule as published

TotalPrepaidAmount shall occur at most once in SpecifiedTradeSettlementHeaderMonetarySummation.

Where this rule applies