SAC /HSN code

I was filled GST registration application with composition scheme for restaurant
my query are as follows:-
1) When I opt . composition scheme than option of supply of service in the page of principal place of business is invisible.

2) When I opt . composition scheme than in the page of goods and services HSN/SAC code.
SAC code is unavailable because I was choose composition scheme
and in goods there is no HSN CODE for restaurant.

please help me out for this what code I choose?
or
was restaurant are not eligible for composition scheme?