attestwireAttestwire › Rule reference › PEPPOL-EN16931-R111
PEPPOL-EN16931-R111 A line period must not end after the invoicing period
noun · Peppol BIS · fatal · BT-135 / BT-74
For a sample invoice, the library reports: Line 1 carries an invoice line period (BG-26) that must not end after the invoicing period ends: the line says 2026-08-31 and the document's invoicing period (BG-14) says 2026-07-31. Peppol requires every line period to fall within the document period.
- Business term
BT-135 / BT-74- Severity
fatal
The fix
Either move lines[0].period.endDate inside the document period, or widen invoicingPeriod.endDate to cover it. If the line genuinely belongs to another period, it belongs on another invoice.
A passing value
"invoicingPeriod": { "startDate": "2026-07-01", "endDate": "2026-07-31" }, "lines": [{ "period": { "startDate": "2026-07-05", "endDate": "2026-07-20" } }]What the library returns
The full error returned by @attestwire/en16931. It includes the rule ID,
affected field and suggested correction. Developers can use this object in their application:
{
"rule": "PEPPOL-EN16931-R111",
"field": [
"BT-135",
"BT-74"
],
"severity": "fatal",
"message": "Line 1 carries an invoice line period (BG-26) that must not end after the invoicing period ends: the line says 2026-08-31 and the document's invoicing period (BG-14) says 2026-07-31. Peppol requires every line period to fall within the document period. A line period that runs past the end of the invoicing period bills for a supply the document has just said it does not cover, which is how the same week gets invoiced twice — once at the end of this period and once at the start of the next. Core EN 16931 constrains each period internally (BR-29, BR-30) but never relates the two, so this is a genuine tightening and one that catches a real class of double billing. This is a Peppol BIS Billing 3.0 profile rule: it applies because profile is \"peppol-bis-3\". It does not apply to the en16931, xrechnung-ubl or xrechnung-cii profiles, whose validators will accept the same document.",
"fix": "Either move lines[0].period.endDate inside the document period, or widen invoicingPeriod.endDate to cover it. If the line genuinely belongs to another period, it belongs on another invoice.",
"example": "\"invoicingPeriod\": { \"startDate\": \"2026-07-01\", \"endDate\": \"2026-07-31\" }, \"lines\": [{ \"period\": { \"startDate\": \"2026-07-05\", \"endDate\": \"2026-07-20\" } }]",
"xpath": "/ubl:Invoice/cac:InvoiceLine[1]/cac:InvoicePeriod/cbc:EndDate",
"docsUrl": "https://attestwire.com/rules/PEPPOL-EN16931-R111"
}
xpath is always a UBL path. On a CII invoice, look for the
matching CII field instead.