# BT-27 Seller Name The full formal name by which the seller is registered in the national registry of legal entities or as a taxable person or otherwise trades as a person or persons > BT-27 (Seller name) is the full legal name of the supplier issuing the invoice. Mandatory under EN 16931, it must match the entity registered under the seller VAT identifier (BT-31). Use the legal form as registered, not a marketing variation. Example: Musterverkäufer GmbH. > > BT-27 · EN 16931 / XRechnung 3.x ## BT Reference Card Canonical EN 16931 / XRechnung facts for this business term — citable from this anchor. - **BT code**: BT-27 - **Name**: Seller Name - **Cardinality**: Mandatory (M) - **Business group**: BG-4 SELLER - **Data type**: Text - **Example value**: Musterverkäufer GmbH ## Quick answer The full formal name by which the seller is registered in the national registry of legal entities or as a taxable person or otherwise trades as a person or persons > **Seller details**: Who issued the invoice and how the recipient can identify that business reliably. ## In plain language The full formal name by which the seller is registered in the national registry of legal entities or as a taxable person or otherwise trades as a person or persons The full formal name by which the seller is registered in the national registry of legal entities or as a taxable person or otherwise trades as a person or persons Essential for identifying the invoice issuer and legal entity responsible for the transaction ## What you usually enter here Free text with standard business name characters Typical valid values include: Mustermann GmbH & Co. KG, ABC Technologies AG, Schmidt Consulting UG (haftungsbeschränkt), Maria Müller Einzelunternehmen Mandatory field for all electronic invoices according to EN 16931 and German e-invoice regulations ## What goes wrong often Avoid values like: , AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA Relevant rule codes: BR-CO-26 ## Examples in context Essential for identifying the invoice issuer and legal entity responsible for the transaction Mandatory field for all electronic invoices according to EN 16931 and German e-invoice regulations ## Valid Examples - Mustermann GmbH & Co. KG - ABC Technologies AG - Schmidt Consulting UG (haftungsbeschränkt) - Maria Müller Einzelunternehmen ## Invalid Examples - AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA ## Related Fields Essential for identifying the invoice issuer and legal entity responsible for the transaction - [BT-28 Seller trading name](/resources/xrechnung/bt-28-seller-trading-name) - [BT-29 Seller identifier](/resources/xrechnung/bt-29-seller-identifier) - [BT-30 Seller legal registration identifier](/resources/xrechnung/bt-30-seller-legal-registration-identifier) - [BT-31 Seller VAT Identifier](/resources/xrechnung/bt-31-seller-vat-identifier) - [BT-32 Seller tax registration identifier](/resources/xrechnung/bt-32-seller-tax-registration-identifier) - [BT-33 Seller additional legal information](/resources/xrechnung/bt-33-seller-additional-legal-information) - [BT-34 Seller Electronic Address](/resources/xrechnung/bt-34-seller-electronic-address) - [BT-35 Seller Address Line 1](/resources/xrechnung/bt-35-seller-address-line-1) - [BT-36 Seller address line 2](/resources/xrechnung/bt-36-seller-address-line-2) - [BT-37 Seller City](/resources/xrechnung/bt-37-seller-city) - [BT-38 Seller Post Code](/resources/xrechnung/bt-38-seller-post-code) - [BT-39 Seller country subdivision](/resources/xrechnung/bt-39-seller-country-subdivision) - [BT-40 Seller Country Code](/resources/xrechnung/bt-40-seller-country-code) ## 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-27 ### Data Type: text ### Cardinality: 1..1 ### Requirement: Mandatory ### Max Length: 200 characters ### Since Version: XRechnung 1.0+ ## XML Implementation ### UBL 2.1 Syntax ``` /Invoice/cac:AccountingSupplierParty/cac:Party/cac:PartyName/cbc:Name ``` ### CII (UN/CEFACT) Syntax ``` /CrossIndustryInvoice/SupplyChainTradeTransaction/ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:Name ``` ## Validation Rules ### BR-CO-26 BR-CO-26 ## Why the standard cares about this field ### Business Context Essential for identifying the invoice issuer and legal entity responsible for the transaction ### Legal Requirement Mandatory field for all electronic invoices according to EN 16931 and German e-invoice regulations ## FAQ ### Should I use the registered company name or trading name? Use the full registered legal name as it appears in official business registers. Trading names should be included in additional seller name fields if needed. ### What about company suffixes like GmbH, AG, or UG? Include the complete legal form (GmbH, AG, UG, etc.) as it is part of the official registered name and required for legal identification. ### Can I abbreviate the seller name if it is very long? The seller name should not be abbreviated as it serves legal identification purposes. If the name exceeds character limits, consider using the additional seller name fields. ## Official sources and tools - [KoSIT Validator](https://erechnungsvalidator.service-bw.de/) - [Invoice Converter](/pdf-to-xrechnung) - [XRechnung Standard](https://xeinkauf.de/xrechnung/) - [Test Suite](https://github.com/itplr-kosit/xrechnung-testsuite)