Thanks for your answer, z929669
I made a reset of SSEdit to its default parameters as indicated in the guide and it seems to work now.
Pfeww ! Spent half the day to figure this out.
Heya
As the title says, whenever I make a "copy as override" of a record in SSEdit, it ends up being greyed out and empty. I am actually trying to make a patch so that an armour mod uses the sounds from "Immersive Sounds" but without this functionality working, it's impossible.
All other SSEdit functions work fine. Thats mind-boggling. SSEdit simply refuses to copy the records into a new .esp, that's it.
If anybody knows what's happening, thanks in advance for shedding some light.