UBL-CR-644: A line price should not carry an exchange rate

What it means

This rule looks at the price of every line in an invoice or credit note and checks that it has no cac:PricingExchangeRate block. UBL offers that block to say how a price in one currency was converted into another. EN 16931 has one invoice currency (BT-5) and prices every line in it. The only second currency it allows is the VAT accounting currency (BT-6), and that applies to the total VAT amount, not to line prices.

Why it matters

EN 16931 does not use a price exchange rate within an invoice or credit note line. This warning concerns the presence of that block, not the conversion calculation.

How to fix it

Convert the price into the invoice currency before you invoice, so the unit price on each line is already in that currency. If the buyer needs to know the rate you used, mention it in the invoice note or the item description. If you build the XML yourself, delete cac:PricingExchangeRate from cac:Price on each line. Check the corrected file again.

The rule as published

A UBL invoice should not include the InvoiceLine Item Price PricingExchangeRate

Where this rule applies