Validation Formula

Summary:

Case: We have a business requirement for a permission employee can submit only 2 or 4 hours other than that should give him an error so I write a validation formula but is not working

DEFAULT for ANC_ABS_ENTRS_ABSENCE_TYPE_ID is 0

DEFAULT for ANC_ABS_ENTRS_DURATION is 0

DEFAULT FOR ANC_ABS_ENTRS_ABSENCE_STATUS_CD is ' '

DEFAULT FOR IV_TOTALDURATION is 0

DEFAULT_DATA_VALUE for ANC_PER_ABS_ENTRS_ABSENCE_ENTRY_ID_ARR is 0

DEFAULT for ANC_ABS_ENTRS_ABSENCE_TYPE_ID is 0

INPUTS ARE iv_start_date (date), iv_end_date (date),IV_TOTALDURATION