Reference
Markdown exportBT-157 Item Standard Identifier
A standard identifier for the item, such as a GTIN. The identifier must carry a scheme identifier attribute from the ISO 6523 ICD list, for example 0160 for GTIN.
Quick answer
Line items
The goods or services on each invoice line, including quantities, prices, and VAT.
Quick actions
In plain language
A global identifier such as a GTIN lets buyer and seller recognise the same item without a bilateral mapping table. Buyers use it for automatic matching against orders, goods receipts, and product master data.
What you usually enter here
Standard item identifier
Typical valid values include: 4006381333931
Defined by EN 16931 for invoice line item identification; mandatory item names and optional identifiers must follow the listed scheme and country code rules.
Where the field sits
- Invoice
- cac:InvoiceLine
- cac:Item
- cac:StandardItemIdentification
- cbc:IDBT-157
- rsm:CrossIndustryInvoice
- rsm:SupplyChainTradeTransaction
- ram:IncludedSupplyChainTradeLineItem
- ram:SpecifiedTradeProduct
- ram:GlobalIDBT-157
What goes wrong often
Relevant rule codes: BR-64, BR-CL-21
Valid Examples
- 4006381333931
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-157
Data Type:
identifier
Cardinality:
0..1
Requirement:
Optional
XML Implementation
/Invoice/cac:InvoiceLine/cac:Item/cac:StandardItemIdentification/cbc:ID/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:IncludedSupplyChainTradeLineItem/ram:SpecifiedTradeProduct/ram:GlobalIDValidation Rules
BR-64
BR-64
BR-CL-21
BR-CL-21
Next step
Check whether your XRechnung sets BT-157 correctly
Upload the XML file to the free validator. It applies the KoSIT rules for XRechnung 3.0 and names each finding with its rule ID, for this field for example BR-CL-21, BR-64. Creating a new invoice instead? The converter checks the invoice against the same rules and shows the findings before download.
Free, no account needed. XML file up to 2 MB.
FAQ
Where does the scheme identifier of BT-157 go?
The scheme identifier is an attribute of BT-157, not a separate business term. In UBL it is cbc:ID/@schemeID in cac:StandardItemIdentification, and in CII it is ram:GlobalID/@schemeID. BR-64 requires the attribute whenever BT-157 is present, and BR-CL-21 requires an ISO 6523 ICD code, for example 0160 for a GTIN.