With the implementation of the EU Directive 2014/55/EU of 16 April 2014, public clients in European tendering procedures are obliged to be able to both receive and process electronic invoices. From 27 November 2020 onwards, all invoices to the federal administration must be submitted electronically. In general, an e-invoice has to be submitted as a so-called XRechnung. Alternatively, another data transfer standard that is equivalent to the European Committee for Standardisation (CEN) may be used.