Error while running hr_sit_api.create_sit API - FLEX-INVALID NUMBER

Question

I am writing an Inbound interface code to import the SIT info. When I tested the  hr_sit_api.create_sit API, it gave me an error ORA-20001: FLEX-INVALID NUMBER. I made sure that the flex id number and id_flex_structure_code are correct. But, I am unable to create a record. Please help me if you have any idea.
Here is my code:
DECLARE
  v_count                     INTEGER := 0;
  n_object_version_number     INTEGER;
  n_analysis_criteria_id      INTEGER;
  n_person_analysis_id        INTEGER;
  n_pea_object_version_number INTEGER;
  n_id_flex_num               INTEGER;
BEGIN
  SELECT fi.id_flex_num
  INTO n_id_flex_num
  FROM fnd_id_flex_structures_vl fi
  WHERE (fi.id_flex_structure_code = 'US_TAX_INFO')
  AND (application_id = 800)
  AND (id_flex_code = 'PEA');
  LOOP
    BEGIN
      ---reset the variables here
      n_object_version_number     := NULL;
      n_analysis_criteria_id      := NULL;
      n_person_analysis_id        := NULL;
      n_pea_object_version_number := NULL;
      hr_sit_api.create_sit(p_person_id        => 33881
                           ,p_business_group_id    => fnd_profile.VALUE('PER_BUSINESS_GROUP_ID')
                           ,p_id_flex_num               => n_id_flex_num
                           ,p_effective_date           => SYSDATE
                           ,p_date_from                 => SYSDATE
                           ,p_date_to                     => NULL
                           ,p_segment1                  => 'X'
                           ,p_segment2                  => 'OH'
                           ,p_segment3                  => 2000
                           ,p_analysis_criteria_id    => n_analysis_criteria_id
                           ,p_person_analysis_id    => n_person_analysis_id
                           ,p_pea_object_version_number => n_pea_object_version_number);
      dbms_output.put_line('Migrated SIT with n_analysis_criteria_id=>' ||
                           n_analysis_criteria_id);
    EXCEPTION
      WHEN OTHERS THEN
        --need to log error here
        dbms_output.put_line('Exception ' || SQLERRM);
    END;
    EXIT; --in this case just one record
  END LOOP;
  COMMIT;
END;

Answer 1

Are you sure you're passing the correct segment values ?
Please make sure the datatypes of the segments match with the values you're passing.
Also make sure you've initialised your session before running the API.