OVRDBF with CPYF / RPG's EXTMBR -- MIDRANGE-L

Subject: OVRDBF with CPYF / RPG's EXTMBR
From: Gad Miron <gadmiron@xxxxxxxxx>
Date: Tue, 2 Sep 2025 17:03:57 +0300
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Hello sages

a programmer has just approached me with a perplexing OVRDBF issue:

Somewhere in a start of a CL PGM he issued an OVRDBF with FILE(XFILE)
MBR(XMBR)
then some 100 lines down he issued a CPYF with TOFILE(XFILE) TOMBR(YMBR)
and the XMBR MBR was populated!
Turns out that OVRDBF's MBR takes precedence over CPYF's TOMBR.

Searching the web I found that OVRDBF's MBR even takes precedence over
RPG's File specs EXTMBR.
https://www.mcpressonline.com/programming/rpg/dont-mix-override-metaphors

Is that so?

If yes, then this old dog has learned a new very old trick.

What say ya ?

Gad

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