[GNC] Where do I find "gnc:option-set-value" and "gnc-set-option"?

[Chris Green]

I just started a new set of accounts with GnuCash 5.6 and I'm getting
a warning:-

    Some deprecated features have been used.  Set the environment
    variable GUILE_WARN_DEPRECATED to "detailed" and rerun the
    program to get more information.  Set it to "no" to suppress
    this message.

This is a little bit odd as all I have done is to copy the accounts
from a previous set of accounts, I've not (consciously) changed
anything.

However, whatever the reason, it would be nice to get rid of the
warning.  I set GUILE_WARN_DEPRECATED to "detailed" as required and
now it says:-

    gnc:option-set-value and indeed all direct option access is deprecated. Use gnc-set-option instead.

I have searched and found a couple of option-set-value entries in
.local/share/gnucash/books/general2024.gnucash.gcm and 
.local/share/gnucash/books/general2024.gnucash_2.gcm 

I've not changed these files myself, something I've done while running
gnucash must have done it.  So, what do I change gnc:option-set-value
to?  

-- 
Chris Green