Copybooks should be avoided for file layouts. Does DDS exist for the file? Did you add the new field to the DDS source code?

For old legacy apps, copybooks were created instead of DDS specs.

But I think that you need DDS to create an LF. Or you can do it with SQL also.

Look at the LF or PF with DSPFD filename.

You will know that an LF was set up properly when the desired key shows up in DSPFD under the "Access Path Description" area and your new key field appears as "Key field ..................CustID" where CustID is your new key field.

If you have DBU that is easier - the new field should be identified as a key field. Press F4 to see K01, K02, K03... etc on each field.

When you compile the pgm, it will automatically bring in the new key field.

-----Original Message-----
From: COBOL400-L [mailto:cobol400-l-bounces@xxxxxxxxxxxx] On Behalf Of Charmaine A. Gray
Sent: Wednesday, October 26, 2016 12:10 PM
To: 'cobol400-l@xxxxxxxxxxxx' <cobol400-l@xxxxxxxxxxxx>
Subject: [Newsletter] [COBOL400-L] PF / LF files


I just started working on an AS400 in April of this year.
I need some help in understanding how to create a new field for a LF (logical File).

I have added the new field to the copybook which holds the file layout.
I have recompiled the program.
I don't know what to do to the actual file to make it larger.

Can you help me?

Thank you,

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