Reference
Markdown exportBT-21 Invoice note subject code
Code that classifies the subject of an invoice note.
Quick answer
Invoice basics
Core document identifiers, dates, process identifiers, and high-level invoice context.
Quick actions
In plain language
Use this only when the invoice note should be machine-classified instead of being plain free text.
What you usually enter here
Approved note subject code
Typical valid values include: AAI
Optional according to EN 16931-1. If provided, use the approved code list.
Where the field sits
This syntax has no separate element for the field.
- rsm:CrossIndustryInvoice
- rsm:ExchangedDocument
- ram:IncludedNote
- ram:SubjectCodeBT-21
What goes wrong often
Avoid values like: note
Valid Examples
- AAI
Invalid Examples
- note
XML mapping and field facts
Open the technical reference if you need XML paths, validator rule codes, legal wording, or schema-specific mapping details.
Field ID:
BT-21
Data Type:
code
Cardinality:
0..1
Requirement:
Optional
Max Length:
10 characters
XML Implementation
Not used in Peppol BIS Billing 3.0 UBL Invoice (BT-21 cardinality is reduced to 0..0)./rsm:CrossIndustryInvoice/rsm:ExchangedDocument/ram:IncludedNote/ram:SubjectCodeNext step
Create an XRechnung from your PDF
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