Skip to content
Change language: English

Error

FX-SCH-A-000029: Include one purchase order number per reference

In short

Error: fails the selected checks.

FX-SCH-A-000029 means an existing purchase order reference contains no ram:IssuerAssignedID element for the purchase order number (BT-13), or contains more than one. Add the missing number entry or remove duplicate entries within that reference.

On this page

What it means

For each ram:BuyerOrderReferencedDocument inside ram:ApplicableHeaderTradeAgreement, the test requires exactly one ram:IssuerAssignedID. It checks the number of child elements, not their text. This rule does not itself require a purchase order reference.

Why it matters

The purchase order number lets the buyer connect the invoice with its order. The profile provides one number element within each purchase order reference.

How to fix it

Correct the purchase order number (BT-13) so its ram:BuyerOrderReferencedDocument contains one ram:IssuerAssignedID with the intended number. If no purchase order reference is needed, remove the reference block rather than leaving a block without its number element. Export again and recheck.

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:IssuerAssignedID' 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-000029 still fails, and which other rules do.

Updated 6 November 2026