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You are essentially correct and I have done this to production files.
In the 10,000' view, this is what I did:
1) Add the fields to the DDS.
2) Do a CHGPF FILE(lib/file) SRCFILE(QDDSSRC) SRCMBR(*FILE)
LVLCHK(*NO). The file now has the new fields.
3) Recompile your RPG programs.
4) Do a CHGPF FILE(lib/file) LVLCHK(*YES)
5) Now start doing whatever programming needs done to actually use these
fields.
Note that the above assumes you're using DDS to define the files. I
have switched to all DDL. I have not added fields to a file since the
switch to DDL, but the steps would be similar. No CHGPF, but ALTER
TABLE statements instead.
Note that LVLCHK(*NO) on the production file was only for the short time
(minutes usually) needed to recompile the affected RPG programs.
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