What in case there is sustainable and non sustainable stock should both be registered or only sustainable stock?

Only sustainable material will be traced on UDB except in the case of blending.

With regards to sustainable fuel, only those consignment reported on UDB (by fuel producers) and further sold to fuel suppliers on UDB will be available to the final fuel supplier to mark the fuel as consumed in the market. Offline reporting of consignments put on market will not be allowed on UDB as this defeats the purpose of UDB from traceability point of view and will lead to double counting/ irregularities. EO would have the report of all consignments put for consumption by final fuel suppliers on real time basis. Additionally, an annual report can be extracted by both EO and the Member states for sustainable fuel.