FX-SCH-A-000044: The amount due is required

What it means

Each document totals block (BG-22, ram:SpecifiedTradeSettlementHeaderMonetarySummation) must contain exactly one ram:DuePayableAmount for the amount due (BT-115). The test counts elements only; it does not check the amount or its calculation. It applies to the Minimum, Basic WL, Basic, EN 16931 and Extended profiles of Factur-X 1.09 and ZUGFeRD 2.5.

Why it matters

The amount due records the remaining balance rather than the full invoice value. An explicit field keeps that distinction clear, including when the invoice has already been paid.

How to fix it

Check the amount due, taking account of payments already made and any rounding adjustment. If nothing remains to pay, include a zero amount rather than omitting the field. Make sure ram:SpecifiedTradeSettlementHeaderMonetarySummation contains one ram:DuePayableAmount with the correct value. Remove repeated entries, export again and recheck.

The rule as published

Element 'ram:DuePayableAmount' must occur exactly 1 times.

Where this rule applies