Overlaying a DS over an entry parm

[Tony Carolla <carolla@xxxxxxxxx>]

I have written a program that accepts a qualified filename as the only
parameter.  My intent was to create a DS, with two fields, object
name, 10 Alpha, and lib name, 10 Alpha.  I then wanted to overlay this
data structure over the entry parm, so that I can access the two
components of the entry parm (which I have validated to contain the
desired data).

I have the following declared (SRCXFER is the name of the program):

     D SRCXFER         PR
     D  SrcFile                      20A
     D SRCXFER         PI
     D  SrcFile                      20A

Then I have declared a pointer:

     D  ParmPointer                    *   Inz(*Addr(SrcFile))

Then the data structure:

     D LibFile         DS                  Qualified
     D                                     Based(ParmPointer)
     D  ObjName                      10A
     D  LibName                      10A

When I attempt to compile, I get an error that states that the initial
address of the pointer (PARMPOINTER) is not valid.  What am I doing
wrong

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