Not necessarily. Are you a travel agent? I am. I don't have every code on the planet.
Tired of the naysayers!
Nobody suggests that you know every code off the top of your head. But, you are capable of obtaining the code through legal sources. Same thing with any aspect of your business. You may not know the J airfare from JFK-LHR on carrier X as you sit here and read this, but you know it in the sense that you could look it up.