type record A{
    O1_Type    a_f1
    O1_Type    a_f2     optional,
    O2_Type    a_f3    optional,
};

type record B{
    B3_Type    b_f1,
    B5_Type    b_f2,
    record of    A   aaa  optional
};

function my_ispresent(in B b_record) return boolean {
  if (b_record.b_f1 == '001'B or b_record.b_f1 == '010'B) {
    return ispresent(b_record.aaa);
  }
  return false;
}