Edit : I was wrong introducing things in the preamble
Inserting in Tex code, at the end of the doc, just before the "commented
off" biblatex box the following lines did the trick
---
\printshorthands
\defbibcheck{noshorthand}{\iffieldundef{shorthand}{}{\skipentry}}
Dear LyX users
For a monograph, I have a long list of shorthands and wish to remove these
references from the main bibliography.
I have seen the following link, but it generates errors if I paste the
beginning of the code in the preamble, and the rest in ERT at the end of
the doc (including, but
