OMNIS7 syntax question

[Mark L. Wise]

I am trying to make sense of the following code:

Calculate GL_AMT as totc(LIST3,pick(#LSEL,0,pick(GL_DR_CR,-GL_AMT,GL_AMT)))

I think it is trying to add up a column in an internal list (LIST3) 
where all of the numbers are stored as positive numbers and based on a 
column GL_DR_CR being 0 or 1 modifying the values to be negative and 
positive as it sums.

I don't understand what the #LSEL and the following zero do in this 
statement...

Can anyone point me either in the right direction or where in the 
documentation I could look?

Thanks!

Mark

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Mark L. Wise

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