You've gotten all the specific answers you need, but I thought I'd chime
in with the more generalized approach. This is Boolean logic or more
precisely Boolean algebra (which is what got me into programming lo
those many decades ago). The specific case is DeMorgan's law, which
not (A and B) = (not A or not B)
A: SML010 <> 5
B: M1PLIN = *blanks
not A: SML010 = 5
not B: M1PLIN <> *blanks
(not A or not B): (SML010 = 5 or M1PLIN <> *blanks)
I use Boolean algebra all the time to simplify complex business logic
(especially IF statements that have grown over time). A nice page for
it exists here:
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