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Error

FX-SCH-A-000679: A contact's phone entry must hold exactly one number

In short

Error: fails the selected checks.

FX-SCH-A-000679 means the telephone entry of the contact at the buyer's tax representative holds no phone number, or more than one. Enter a single phone number, or remove the telephone entry.

On this page

What it means

A contact person (ram:DefinedTradeContact) at the buyer's tax representative can have a telephone entry (ram:TelephoneUniversalCommunication). If that entry is present, it must contain exactly one number (ram:CompleteNumber). The check fails on an empty entry and on an entry with two or more numbers.

Why it matters

The recipient uses contact details to ask questions about an invoice. An entry with no number, or with two, does not fit the structure of the Extended profile. This is an error, so the file can be rejected.

How to fix it

Open the tax representative's contact in your invoicing software and enter one phone number, or clear the phone field if you have none. If two numbers were entered, keep the one the recipient should call. In the XML, keep one ram:CompleteNumber inside ram:TelephoneUniversalCommunication, or leave the whole element out.

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-000679 still fails, and which other rules do.

Updated 5 November 2026