To ensure that an electronic invoice reaches the correct recipient within the German federal administration, each authority requires a unique routing ID - a mandatory identifier without which automated forwarding will not work.

Route ID
The routing ID is a mandatory identifier that uniquely identifies the invoice recipient within the German federal administration and ensures the correct forwarding of electronic invoices to the responsible authority.
Context: When creating a XInvoice The routing ID must be specified in the „Buyer reference" field (Business Term BT-10) when sending invoices to public clients. If it is missing or incorrect, automated processing will fail - and so will timely payment. Allocation is regulated at two levels: For federal authorities, the Central Federal Finance Office (ZFB) is responsible, for state authorities the respective issuing offices according to the current KoSIT state synopsis. The leitweg-id.de portal is also available for validation or manual generation.
Demarcation: The routing ID is only relevant in the context of e-invoices to public clients. In the purely private sector B2B-This mandatory information does not apply to invoice transactions.