[Scip] Optimal duals in *.sol returned by SCIPAMPL

[Vladimir VV]

Dear all,
Is it possible to get optimal dual variables by *.sol file returned by
SCIPAMPL ?
I see following operator
write_sol((char*)msg, x, NULL, NULL);
in line #1386 of
.../scip-3.1.0/interfaces/ampl/src/reader_nl.c

So, nothing duals (the first NULL) nor "wantsol" options ?
What is the reason of that ?
BTW, the same was for scip-3.0.2...

Thanks in advance.
Vladimir V. Voloshinov.