BR-12 error
BR-12 means the invoice is missing its Sum of Invoice line net amount — the header-level total of all lines' net amounts.
What this rule checks
Explanation
Every invoice must state the Sum of Invoice line net amount (BT-106) — a header-level total equal to the sum of all invoice lines' net amounts, before any document-level allowances or charges are applied. This rule fires when that total is missing entirely, not when it's present but wrong (a present-but-wrong total is BR-CO-10 instead).
How to fix it
Populate the line-total element (UBL: cbc:LineExtensionAmount under LegalMonetaryTotal; CII: ram:LineTotalAmount under SpecifiedTradeSettlementHeaderMonetarySummation) with the sum of every invoice line's net amount.
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