Reference
BT-57 Buyer contact telephone number
Telephone number for the buyer contact point.
Quick answer
Who receives the invoice and which buyer records or routing data must match.
In plain language
Telephone number for the buyer contact point.
Telephone number for the buyer contact point.
Provide this only when the invoice recipient expects telephone contact details in the structured invoice.
What you usually enter here
Telephone number
Typical valid values include: +49 30 123456
Optional according to EN 16931-1.
What goes wrong often
Avoid values like:
Examples in context
Provide this only when the invoice recipient expects telephone contact details in the structured invoice.
Optional according to EN 16931-1.
Valid Examples
- +49 30 123456
Invalid Examples
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-57
Data Type:
text
Cardinality:
0..1
Requirement:
Optional
Max Length:
50 characters
Since Version:
Optional
XML Implementation
/Invoice/cac:AccountingCustomerParty/cac:Party/cac:Contact/cbc:Telephone/CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:BuyerTradeParty/ram:DefinedTradeContact/ram:TelephoneUniversalCommunication/ram:CompleteNumberWhy the standard cares about this field
Business Context
Provide this only when the invoice recipient expects telephone contact details in the structured invoice.
Legal Requirement
Optional according to EN 16931-1.