*ISO Date fieldin ILE from CLLE

I've done some testing and searching and can't get the following to
work, so I must be missing something somewhere, so hopefully one of you
can help me out.

The Setup
=========

I have an RPG ILE service program with several subprocedures in it.  One
of them, IsRchStrDt, has a prototype that looks like this:

     D IsRchStrDt      PR            
1A                                                     
     D  TestDate                       D   DatFmt(*ISO) Value

Within the service program, the procedure interface looks like this:

     P IsRchStrDt      B                  
Export                                           
     D IsRchStrDt      PI            
1A                                                    
     D   TestDate                      D   DatFmt(*ISO) Value

What this subprocedure does is determine if the date in question is a
period start date (i.e., on a 28-day boundary) for a particular customer
of ours.  It returns a "Y" if it is on a 28-day boundary, or returns an
"N" if it is not.  It is used like this in RPG:

        Eval      YesNoCode = IsRchStrDt(SomeDateFld)
            -or-
        If        IsRchStrDt(SomeDateFld) = 'Y'

It works great from RPG ILE calls with no problem.


Now The Problem
===============

I want to use it in CL ILE via CALLPRC.  I've used CALLPRC before, but
no too often.  And there isn't a whole lot of info that I can find
regarding just how to set up a date data type in CL, since CL doesn't
recognize date data types.  I have tried it with a *CHAR length 10 field
with "2000-03-06" in the field with no luck.  I have tried the
subprocedure with and without the VALUE on the prototype.  All I can get
is invalid data in date/time/timestamp field.

So I got smart.  I thought.  I added the following subprocedure to the
service program:

     D IsRchStrD8      PR            
1A                                                    
     D  TestDate8                     8S 0 Const

and the procedure interface is:

     P IsRchStrD8      B                   Export 
     D IsRchStrD8      PI             1A          
     D   TestDate8                    8S 0 Const  

This subprocedure simply converts the input date to an *ISO field (which
happens to be a call to another service program that does these types of
conversions), then calls IsRchStrDt with the converted date.  Now, I
thought, I'll pass an 8-character field like "20000306".  Still no
work.  Tried defining the field in the CLLE program as *DEC length 8. 
Still no work.

What am I missing?  Within the subprocedure, do I need to move the input
parm to another field first?
Thanks for any help.

-- 
-Jeff
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