"Undefined Fuel, reserved for Proprietary" is a standardized product code category used in fuel transaction processing, specifically within the WEX (Wright Express) and NACS (National Association of Convenience Stores) coding systems.
Update POS Software: Check if the POS requires a software update to recognize newer alternative fuel codes. undefined fuel-reserved for proprietary
However, the standards body leaves a block of "empty" codes reserved. These are specifically for proprietary use by vendors or merchants. When your system displays this error, it means: "Undefined Fuel, reserved for Proprietary" is a standardized
`$undefinedVariable fuel-reserved $forProprietaryFlag`
Reserved for NACS Future Use (063–070): Held for new fuel types that may be standardized later. Reserved for NACS Future Use (063–070): Held for