Reading old IBM documentation for System/360 and 370, from the 70s and 80s, I thought it was interesting that what we today would probably call "business logic"

Reading old IBM documentation for System/360 and 370, from the 70s and 80s, I thought it was interesting that what we today would probably call "business logic", back then IBM apparently used to call "problem code" or "problem program". I don't know if this is coincidence, or if that term was more widespread at the time. It's clearly meant to mean "the code that solves the actual problem", but it still sounds a bit unfortunate.