PEPPOL-EN16931-R121

Explanation

The price base quantity states how many units the price refers to (such as 100 in '€5 per 100 pieces'). If given, it must be greater than zero; zero or a negative value makes the line amount impossible to calculate.

How to fix

Ask the seller for a corrected invoice with a price base quantity above zero, or without one if the price is per single unit. This usually comes from the seller's invoicing software, not from data entry.