On 10 March 2012 the German customs authorities introduced a new release of software used for customs declarations. Since that date it is a requirement to state the EORI number of the importer of goods to Germany or in case of imports to Germany with consecutive onward supply to another EU country. Please note that it is no longer possible to declare imports online without a valid EORI number, the old German customs number is not sufficient.
If you need further details, please do not hesitate to contact me.