GREATEST Function?

[Fuzzmaster]

Trying to return the value of an expression or zero if the expression is negative. I thought this would work:

GREATEST(((ROUND(INV.MerchAmt) - 1)*0.12),0)

Anyone have a working method? Reasons why this method doesn't?

 

[Fuzzmaster]

Apparently I am not aging as gracefully as I'd like. It works just fine once you remove sloppy fingers and include a bit of basic reading ability.