Multiple indices/indexes and Memoir

[Mathias Girel]

Dear listers
In the other manuscript I'm editing, in the Memoir class, I'm inserting
index entries but having access to Lyx's native handling of multiples
indices would be extremely helpful.
I know that in the past it required a special handling just for this class
(see https://wiki.lyx.org/Tips/Indexing), but I'm nore sure if that's still
a thing.

In my document, if I select multiple indexes, and create an index rerum,
for example, it generates an error (seen screenshot). I have the exact same
message even if I'm using a MWE (one paragraph, two entries belonging to
two indexes).
My question is: is it a necessary consequence of the Memoir class (implying
some tricky workaround as explained in the wiki), or is there a neat
workaround in Lyx, for example by adding something in the preamble to avoid
this conflict?
I can live with a single index, if it's too complex to solve, but I really
like the way multiple indices are integrated in LyX, which makes inserting
entries so easy.
Thanks for your help! (and kudos for the great work on 2.4!!)
Mathias
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