I've tried to set
in the preamble but I've discovered that this command is already defined.
So, I tried native command on my code and I've found that it is a "simple" double S.
Now, I can fix my problem using
but I'm not sure it is safe (I don't know if
\SS is used by LaTeX only to draw a (simple or special) double S, or for something else too).
Does someone know if it is safe (or when it isn't safe) to do a “renewcommand” of