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Documentation overview
Understand formats and standards
Compliance Guides
XRechnung Standard
ZUGFeRD Format
PDF/A-3 for ZUGFeRD
CII Cross Industry Invoice
UBL Universal Business Language
DIN EN 16931-1 Standard
PEPPOL Network
Country and regulatory rules
EU E-Invoicing Mandate
EU E-Invoicing
EU e-invoicing in 2026: what to implement (and why)
EU top markets playbook (DE, FR, IT, ES, PL, NL)
PEPPOL in the EU: how exchange actually works
CTC/clearance and portals in the EU: how to build reliable integrations
Country Guides
Germany
France
Italy
Spain
Poland
Netherlands
Belgium
Austria
Denmark
Sweden
Finland
Fix validation and submission issues
Leitweg-ID Validation
Support playbooks
Support
Why invoices need review
API errors
API automation
Handling schema errors
Review validation help
Support
Missing information
Buyer reference
Payment and IBAN
VAT and reverse charge
Totals and rounding
Prepayments
Line items
ZUGFeRD PDF warnings
Validation playbooks
Observed validation fixes
Due date or terms
Bank transfer IBAN
PDF/A-3 readiness
VATEX exemption reason
Review vs download
Public test invoice fixture library
Valid XRechnung UBL basic invoice
Invalid XRechnung missing payment terms
Factur-X/ZUGFeRD EN 16931 CII XML
XRechnung rounding and IBAN edge case
KoSIT Validator Errors
ERROR
BR-DE-1
BR-DE-2
BR-DE-3
BR-DE-4
BR-DE-5
BR-DE-6
BR-DE-7
BR-DE-8
BR-DE-9
BR-DE-10
BR-DE-11
BR-DE-12
BR-DE-13
BR-DE-14
BR-DE-15
BR-DE-16
BR-DE-17
BR-DE-18
BR-DE-19
BR-DE-20
BR-DE-21
BR-CO-3
BR-CO-4
BR-CO-9
BR-CO-10
BR-CO-11
BR-CO-13
BR-CO-14
BR-CO-15
BR-CO-16
BR-CO-17
BR-CO-25
BR-CO-26
BR-S-1
BR-S-5
BR-S-8
BR-61
BR-AE-02
BR-AE-10
BR-E-01
BR-E-05
BR-05
BR-22
BR-23
BR-24
BR-25
BR-26
BR-47
BR-57
BR-DE-22
BR-DE-30
BR-DE-31
PEPPOL-EN16931-R001
PEPPOL-EN16931-R010
PEPPOL-EN16931-R020
PEPPOL-EN16931-R046
PEPPOL-EN16931-R120
PEPPOL-EN16931-R130
WARNING
BR-DE-26
BR-DE-27
BR-DE-28
Look up reference data
Glossary
E
EN 16931
E-reporting
e-Factura RO
EAS (Electronic Address Scheme)
ebInterface
C
CIUS
CII
Code list
Credit note
Contract reference
Chorus Pro
Codice Destinatario
X
XRechnung
XML Schema (XSD)
XML
Z
ZUGFeRD
F
Factur-X
Finvoice
U
UBL
Unit code
P
PEPPOL
PEPPOL BIS
Participant ID
PDF/A-3
Payment means
Purchase order (PO)
PDP (Plateforme de Dématérialisation Partenaire)
A
Access Point
Allowance / charge
S
SMP
SML
Schematron
SDI (Sistema di Interscambio)
Svefaktura
L
Leitweg-ID
K
KoSIT
KSeF
KvK number
V
Validation
VAT ID
ViDA
VeriFactu
ViDA Pillar 1: Digital Reporting Requirements
ViDA Pillar 2: Single VAT Registration
ViDA Pillar 3: Platform Economy
B
Business Term (BT)
Business Group (BG)
BIC
R
Reverse charge
Real-time reporting
Real-time invoice reporting (RTIR)
T
Tax category
TicketBAI
I
IBAN
Invoice type code
Invoice line item
ISO 6523
D
Document reference
D-U-N-S Number
Digipoort
Q
QR code payment
G
GLN (Global Location Number)
O
OVT-tunnus
OIOUBL
N
NemHandel
Code Lists
Currency codes (common)
Country codes (common)
VAT category codes
Payment means type codes
Unit of measure codes (common)
Invoice type codes (common in XRechnung)
XRechnung Fields
Invoice basics
BT-1
BT-2
BT-3
BT-5
BT-6
BT-7
BT-8
BT-10
BT-11
BT-12
BT-14
BT-15
BT-16
BT-17
BT-18
BT-19
BT-21
BT-22
BT-23
BT-24
BT-25
BT-26
Delivery and payment
BT-9
BT-13
BT-20
BT-59
BT-60
BT-61
BT-70
BT-71
BT-72
BT-73
BT-74
BT-75
BT-76
BT-77
BT-78
BT-79
BT-80
BT-81
BT-82
BT-83
BT-84
BT-85
BT-86
BT-87
BT-88
BT-89
BT-90
BT-91
Seller details
BT-27
BT-28
BT-29
BT-30
BT-31
BT-32
BT-33
BT-34
BT-35
BT-36
BT-37
BT-38
BT-39
BT-40
BT-41
BT-42
BT-43
BT-62
BT-63
BT-64
BT-65
BT-66
BT-67
BT-68
BT-69
Buyer details
BT-44
BT-45
BT-46
BT-47
BT-48
BT-49
BT-50
BT-51
BT-52
BT-53
BT-54
BT-55
BT-56
BT-57
BT-58
Discounts and charges
BT-92
BT-93
BT-94
BT-95
BT-96
BT-97
BT-98
BT-99
BT-100
BT-101
BT-102
BT-103
BT-104
BT-105
Taxes and totals
BT-106
BT-107
BT-108
BT-109
BT-110
BT-111
BT-112
BT-113
BT-114
BT-115
BT-116
BT-117
BT-118
BT-119
BT-120
BT-121
BT-122
BT-123
BT-124
BT-125
Line items
BT-126
BT-127
BT-128
BT-129
BT-130
BT-131
BT-132
BT-133
BT-134
BT-135
BT-136
BT-137
BT-138
BT-139
BT-140
BT-141
BT-142
BT-143
BT-144
BT-145
BT-146
BT-147
BT-148
BT-149
BT-150
BT-151
BT-152
BT-153
BT-154
BT-155
BT-156
BT-157
BT-158
BT-159
BT-160
BT-161
BT-162
BT-163
BT-164
BT-165
BT-185
BT-186
ZUGFeRD Profiles
MINIMUM
BASIC WL
BASIC
EN 16931
EXTENDED
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  3. E-Invoicing Resources
  5. Glossary
  7. Document reference

Reference

Markdown export

Document reference

Link from an invoice to another document (order, contract, prior invoice).

DefinitionExplanationRelated resourcesRelated terms

Definition#

Link from an invoice to another document (order, contract, prior invoice).

Explanation#

Improves traceability and automation in accounts payable.

Often required in public procurement contexts.

Related resources#

XRechnung fields

Related terms#

Credit note

Document that reduces or cancels a previously issued invoice amount.

Purchase order (PO)

Buyer-issued document ordering goods/services, often referenced by an invoice.

Contract reference

Identifier linking an invoice to a contract or framework agreement.

Credit notePurchase order (PO)
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DefinitionExplanationRelated resourcesRelated terms

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