$assembly2_part->add_assemblies(SL::DB::Assembly->new(parts_id => $assembly3_part->id, qty => 5, bom => 1));
$assembly2_part->save;
# fetch assembly item corresponding to partnumber 20000
my $assembly2_items = $assembly2_part->find_assemblies() || die "can't find assembly_item";
$assembly2_part->add_assemblies(SL::DB::Assembly->new(parts_id => $assembly3_part->id, qty => 5, bom => 1));
$assembly2_part->save;
# fetch assembly item corresponding to partnumber 20000
my $assembly2_items = $assembly2_part->find_assemblies() || die "can't find assembly_item";