Hi Pallen,
Thanks for answering!
I could eventually figured my problem out.
I had one .lvlib (main lib, let's call A.lvlib), at the root of the tree, that contained others .lvlib (containing the alarm shared variables, let's call them X.lvlib, Y.lvlib, etc). For some unknown reason I couldn't get the description field of the shared variable when placed in X.lvlib, Y.lvlib, etc. while I could get other fields (!?)
Placing X.lvlib, Y.lvlib, etc at the root of the tree (and not into an other "main" .lvlib), I can get the description of the shared variable like expected.
Thanks very much