Solve the problem that 'TYPE OCTECT STRING' fails to generate corresponding item.

ClassObj S1AP-PROTOCOL-IES ::= {
  { ID id-eNB-UE-S1AP-ID   CRITICALITY reject   TYPE ENB-UE-S1AP-ID  PRESENCE mandatory}|
  { ID id-S1-Message       CRITICALITY reject   TYPE OCTET STRING    PRESENCE mandatory}|
  ...
}