use feature 'postderef'; # Needed in perl 5.20 and 5.22

my @aoh = (
            { id_1 => "F1", id_2 => "F2", v => "FV" },
            { id_1 => "S1", id_2 => "S2", v => "SV" },
            { id_1 => "T1", id_2 => "T2", v => "TV" },
          );

my %hash;
foreach my $href (@aoh)
{
  my ($id_1, $id_2) = delete $href->@{'id_1', 'id_2'};
  $hash{$id_1}{$id_2} = $href;
}