https://www.e-rechnung-bund.de/e-rechnung/merksatze-zur-erechnung/ ">
To activate the e-invoice in ZUGFeRD format, go to your system settings in the Invoice area. Activate the e-invoice there and add your company data.
Then please go through your customer list once and complete the newly appeared field Country code
If you now send an invoice from your Labordatenbank, there is an embedded attachment in the PDF, an XML file that maps the X invoice format. You can display this in a PDF viewer.
VAT ID
customers.DDF_UID
Mandatory for invoicing foreign customers.
Mandatory for domestic invoices (AT) exceeding €10,000.
Buyer Reference
customers.DDF_Buyer_Reference
Used for field BT-10 in e-invoices.
Mandatory for invoicing public authorities.
Vendor number/Seller IDcustomers.DDF_Seller_ID
Used for field BT-29 for e-invoices.
Order Number
invoices.DDF_Order_Reference
Used for field BT-14 in e-invoices.
Mandatory for invoicing public authorities.
Buyer's Order Number
invoices.DDF_Buyer_Order_Reference
Used for field BT-13 in e-invoices.
Service Period From
invoicesDDF_Billing_Period_Start
Used for field BT-73 for e-invoices.
Service Period To
invoicesDDF_Billing_Period_End
Used for field BT-74 for e-invoices.
Delivery timeinvoices.DDF_Delivery_Time
Used for field BT-72 for e-invoices.
Last change: 12.11.2025
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