Re: Data Structure with same physical file format and fields two times

Why not have just one data structure and then stand-alone fields that are like the data structure?

d RecordDS e ds extname(MyFile)
d BeforeImage s like(RecordDS)
d AfterImage s like(RecordDS)

Then, at the appropriate spots,
BeforeImage = RecordDS
...
AfterImage = RecordDS

(I like this approach especially when loading a subfile. I load the before image as a hidden field, and then I know when the data is changed on the screen, and also when the data has been changed at another workstation.)

On Fri, Oct 2, 2009 at 10:33, Jim Essinger <dilbernator@xxxxxxxxx> wrote
All,

I know it must be something simple that I am missing. I want the structure
of a physical file in my program twice, renaming the fields so I can
compare
a before and after picture.

My code;

* Old record data structure
D oorddtl E DS EXTNAME(myfile) prefix('or':2)
D
* New record data structure
D norddtl E DS EXTNAME(myfile) prefix('nr':2)
D

The compile error I am getting is;

*RNF3534 20 a 003500 The parameter for keyword PREFIX is not valid;
keyword is ignored.

As I am still new(er) to ILE RPG (reformed COBOL programmer and previous
RPG
III programmer), my reading of the manual says this should be possible. So
what am I missing?

Thanks!

JIm