Thanks to all of you. Sometimes, I overthink answers. :)

> Array notation is kind of funny about this. In array notation, your
> variable name is arguments.strCustomFees, which does exist. You can't
> use isDefined to identify a missing position within an array. If you
> changed this to dot notation, this would work, but the better 
> solution
> is to use structKeyExists as Cameron and Matt suggested.
> 
> Dave Watts, CTO, Fig Leaf Software
> http://www.figleaf.com/
> http://training.figleaf.com/
> 
> Fig Leaf Software is a Veteran-Owned Small Business (VOSB) on
> GSA Schedule, and provides the highest caliber vendor-authorized
> instruction at our training centers, online, or onsite.

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