Indicator overlay/rename question

I have started using the following method for renaming any indicators I use
(which are VERY few).  

     D IndicatorPtr    S               *   Inz(%Addr(*In))
     D                 DS                  Based(IndicatorPtr)
     D PrtOverflow            99     99

As you probably already know, this allows me to use the PrtOverflow in my
code instead of the vague *In99.  Beautiful.  But now, in my calc specs, in
testing the indicator for 'on'-ness, I can't do the following:

   If PrtOverflow;
      Write Header;
      PrtOverflow=*Off;  
   EndIf;

This works if I use *In99 instead of PrtOverflow.  The first line of that
statement brings up the following error:

*RNF7423 30  000133  A relational expression or indicator is expected for
logical operations

I have to change the first line to 

   If PrtOverflow=*On;

I have been told by a good friend of mine that the statement is basically
asking, 'If it's true that it's true'.  Is there a way I can change the
technique to allow the first 'if' statement?  

Tony Carolla
MedAmerica Billing Services, Inc.