Additional Notes
International Standard Code
Please make sure that all units of measure you use in e-invoice have the International Standard Code field maintained. Use the UNECERec20 list for this purpose.

Specifying a VAT Category Code
If you specify a code in the VAT Category Code (BT-118) that implies VAT exemption, you must also specify a VAT Exemption Reason Text (BT-120). In Business Central, the VAT Clause Code field is used for this purpose. If the field is not filled, an error will occur in the e-invoice validation check.
E-Rechnung Periods in Sales and Service
In service orders, service invoices and service credit memos, as well as in the sales documents of the same name, an E-Rechnung start and end date can be added at line item level.

This data is also adopted in posted sales and service documents and the E-Rechnung document.

