Transactions may show up in reports as "Unknown" or "Other." According to WEX product guidelines
As the industry moves toward transparency and environmental accountability, the era of "Undefined Fuel" may be drawing to a close. Regulatory bodies are increasingly demanding that "black box" algorithms be made explainable. undefined fuel-reserved for proprietary
In the petroleum industry, products like Unleaded, Diesel, and Biodiesel are assigned specific codes (such as ) to ensure proper billing and tax reporting across different networks. When a transaction involves a fuel type that a system cannot specifically identify, it defaults to a "proprietary" or "undefined" status. Technical Context Transactions may show up in reports as "Unknown" or "Other
These codes are "reserved" so that individual fuel providers or fleet owners can define them for their own special products without conflicting with standardized industry codes. When a transaction involves a fuel type that