Creating a function and passing query value

I have what I thought was a pretty easy to resolve situation:
I want to concatenate two query fields, if the 2nd one isn't empty.
I created a function:
<cfargument name="q1" value='#query.q1#' />
<cfargument name="q1a" value='#query.q1a#' />
<CFSET variables.myPunct = ": ">
<cfset variables.ResultVar="">
<cfif Trim(arguments.q1) NEQ "">
<cfset variables.ResultVar='#arguments.q1#'>
</cfif>
<cfif Trim(arguments.q1a) NEQ "">
<cfif variables.ResultVar NEQ "">
<cfset variables.ResultVar='#variables.ResultVar &
variables.myPunct#'>
</cfif>
<cfset variables.ResultVar='#variables.ResultVar &
arguments.q1a#'>
</cfif>
<cfreturn variables.ResultVar>
This is basically just the example they provide in the online
instruction, with the names changed.
In the detail band of my report, I have an expression builder
field containing: report.mytestfunction()
When I run this, I get: Element Q1 is undefined in ARGUMENTS.
I've tried this ninety different ways (literally). It seems
very clear to me that the query.q1 (for that matter, any of the
query results) are NOT getting passed to the function. I have tried
making the expression: report.mytestfunction(query.q1). I have
tried creating an input parameter.
The documentation on this is ridiculously limited,
considering that the ability to implement conditional logic depends
entirely on the "function", as far as I can tell. I can in no way
get the function to interface with the query results. If is set
fixed values in the function, as opposed to trying to use the query
variables, it outputs fine.
Any ideas?

That has got to be the only way I DIDN'T try, although I
could swear I tried that, too. Maybe I didn't have the "required"?
I don't know. I know it works now. For the record, FUNCTION:
<cfargument name="q1" required="yes" />
<cfargument name="q1a" required="yes" />
<CFSET variables.myPunct = ": ">
<cfset variables.ResultVar="">
<cfif Trim(arguments.q1) NEQ "">
<cfset variables.ResultVar='#arguments.q1#'>
</cfif>
<cfif Trim(arguments.q1a) NEQ "">
<cfif variables.ResultVar NEQ "">
<cfset variables.ResultVar='#variables.ResultVar &
variables.myPunct#'>
</cfif>
<cfset variables.ResultVar='#variables.ResultVar &
arguments.q1a#'>
</cfif>
<cfreturn variables.ResultVar>
In the "Detail" band, called function:
report.mytestfunction(query.q1, query.q1a)
Thanks for the tip. I'm going to go take a long walk on a
short pier now.
max

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