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Error

FX-SCH-A-001044: A line seller's fax contact needs exactly one number

In short

Error: fails the selected checks.

FX-SCH-A-001044 means your contact fax block for the seller on an invoice line contains no ram:CompleteNumber element or more than one. Keep one ram:CompleteNumber containing the contact's fax number.

On this page

What it means

In Factur-X and ZUGFeRD Extended, each ram:FaxUniversalCommunication inside ram:DefinedTradeContact of the line's ram:ItemSellerTradeParty must contain one ram:CompleteNumber. The test counts elements, not numbers written within a single element.

Why it matters

Each fax communication block has one number field in the required XML structure. Missing or repeated number elements do not match that structure.

How to fix it

Correct ram:FaxUniversalCommunication inside the line seller's ram:DefinedTradeContact. Add the missing ram:CompleteNumber or remove duplicate elements, leaving one with the intended fax number. Export the corrected file and check it again.

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:CompleteNumber' must occur exactly 1 times.

Where this rule applies

Rule set Version
Factur-X 1.09 EXTENDED 1.0.9-2
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-001044 still fails, and which other rules do.

Updated 6 November 2026