prototyped fields & global field definitions

Hi,
In a procedure I have
        D PROC_A                PI
        D FIELD_1                       12
        D FIELD_2                         8
In the same procedure, I have a DSPF file 
defined globally (that is, the F spec comes before the procedure B
statement).

In the DSPF file, I have FIELD_1 defined as a program-to-system field.

I'm trying to get the FIELD_1 that is passed in when PROC_A is called
to be sent to the DSPF in the form of the program-to-system field.

When the procedure runs, FIELD_1 does not reflect the value of
FIELD_1 that was passed in with the call to PROC_A, and the compile
lists message ID
 *RNF7031 - name is not referenced 
for the FIELD_1 definition listed  with the DSPF field references.

I thought that having the DSPF defined globally was relative to
the compile unit, so that any fields defined locally within
that same compile unit would be aware of the global definitions.
That's not the behavior that I'm witnessing.
Can anyone clear up my misconceptions?
TIA,
Dave
















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