PEPPOL-EN16931-R043-2

Explanation

The ChargeIndicator on a line-level allowance or charge must be 'true' (charge) or 'false' (allowance).

How to fix

Set ChargeIndicator correctly. (Typically a software-side issue, not user input — raise this with your invoicing software vendor; if you're receiving the invoice, ask the sender to address it with theirs.)