unable to save the service order

Hi Folks,

we are creating a service order by calling CRM_ORDER_READ and CRM_ORDER_MAINTAIN, and at last we are trying to save the service order by calling the CRM_ORDER_SAVE, but unable to save this please suggest me what would be the wrong

for your reference

CALL FUNCTION 'CRM_ORDER_SAVE'

    EXPORTING

      it_objects_to_save   = lt_order_guids

      iv_update_task_local = 'X'

    IMPORTING

      et_saved_objects     = lt_saved_objects

      et_objects_not_saved = lt_not_saved_objects

  EXCEPTIONS

      document_not_saved   = 1

      OTHERS               = 2.