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Error

FX-SCH-A-000019: Give the invoice exactly one invoice number

In short

Error: fails the selected checks.

FX-SCH-A-000019 means the document header contains no ram:ID element for the invoice number (BT-1), or contains more than one. Correct the invoice number entry so your export contains exactly one such element, then check the new file.

On this page

What it means

Within rsm:ExchangedDocument, the test counts ram:ID elements. There must be exactly one. This rule checks the number of elements, not whether the number is filled in or correct.

Why it matters

The invoice number identifies the document when you or the recipient refer to it. The profile provides one header element for this number.

How to fix it

Check the invoice number field and correct the export so it writes one ram:ID inside rsm:ExchangedDocument. Add the missing entry or remove duplicate elements, keeping the correct invoice number. Export again and recheck the file.

Once the file is corrected, check it again for free: Validate a ZUGFeRD invoice

Or fix the invoice in a form and download the corrected file, for 1 credit: Fix a rejected e-invoice Beta

The rule as published

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

Where this rule applies

Rule set Version
Factur-X 1.09 MINIMUM 1.0.9-2
Factur-X 1.09 BASIC WL 1.0.9-2
Factur-X 1.09 BASIC 1.0.9-2
Factur-X 1.09 EN 16931 1.0.9-2
Factur-X 1.09 EXTENDED 1.0.9-2
ZUGFeRD 2.5 MINIMUM 2.5.2
ZUGFeRD 2.5 BASIC WL 2.5.2
ZUGFeRD 2.5 BASIC 2.5.2
ZUGFeRD 2.5 EN 16931 2.5.2
ZUGFeRD 2.5 EXTENDED 2.5.2
Rule text from phive-rules 4.6.4.

Check your file

Drop your e-invoice to see whether FX-SCH-A-000019 still fails, and which other rules do.

Updated 8 November 2026