In Austria, it was already announced that the portal e-Rechnung.gv.at will no longer accept e-invoices in ebInterface 4.0, 4.1, and 4.2 effective January 1, 2022. However, companies can continue using older versions until December 31, 2021, to have enough time to migrate to one of the newer versions. The easiest way is to use version 4.3, which is supported by ebInterface like version 6.0, so it is recommended to upgrade to version 6.0.
Source eBusiness eXpert
