PEPPOL-EN16931-R120 The invoice line net amount, recomputed a second way
The invoice line net amount must equal quantity times net price divided by base quantity, plus line charges, minus line allowances. Peppol allows a tolerance of 0.02 here, an eighth of what EN 16931 grants the VAT rules.
- Business term
BT-131
You cannot trip this rule. It constrains a figure this library computes for you rather than one it reads from your invoice, so no input reaches it.
The line net amount this library multiplies out. The rule recomputes it a second way and compares. If this rule ever does fire, it is a
defect in @attestwire/en16931 and not in your invoice.
Send it to
hello@attestwire.com
rather than changing your data to work around it.
Why there is no error payload here
Every other page in this reference carries the exact
TeachingError the library returns, harvested by running it
at build time. This one cannot: the rule guards a figure the library
computes rather than one it reads, so there is no invoice that produces
the object. Publishing an invented one would break the only promise the
reference makes.
The rule is implemented, and it runs on every document. It is an assertion about our arithmetic, kept so that a regression in the totals is caught here rather than by a tax authority.