BR-S-05
A rule of the European standard EN 16931 – applies to every invoice following the standard, including Peppol BIS Billing 3.0.
What this error means
BR-S-05
In a line with standard-rated VAT (category S) the rate is 0 — a standard rate must be greater than zero.
How to fix it
Set the line cbc:Percent to a real rate (e.g. 21); if it truly is 0, use another category — Z, E or AE.