UNION ALL IS NOT WORKING WITH GROUP BY IN SQL - sql

Question

I have to create a query that shows whether the employees has taken what kind of leave on time card or if they have taken any leave "Vacation".
The output should look like:
SELECT person_number,
Sum(
CASE
WHEN element = 'Overtime' THEN measure
END) AS overtime_measure_hours,
Sum(
CASE
WHEN elements LIKE 'Regular Pay' THEN measure
END) AS regular_measure_hours,
Sum(
CASE
WHEN elements IN ( 'Double_Time' ) THEN measure
END) AS Other_amount,
Max(
CASE
WHEN elements IN ( 'Double_Time' ) THEN 'Double'
END) AS Other_code
(
SELECT papf.person_number,
atrb.attribute_category element,
atrb.measure measure_hours,
rec.start_date,
rec.end_date
FROM per_all_people_f papf,
hwm_tm_rec rec,
fusion.hwm_tm_rep_atrbs atrb,
fusion.hwm_tm_rep_atrb_usages ausage,
hwm_tm_statuses status
WHERE 1=1
AND atrb.tm_rep_atrb_id = ausage.tm_rep_atrb_id
AND ausage.usages_source_id = rec.tm_rec_id
AND ausage.usages_source_version = rec.tm_rec_version
AND status.tm_bldg_blk_id = rec.tm_rec_id
AND status.tm_bldg_blk_version = rec.tm_rec_version
AND rec.tm_rec_type IN ( 'RANGE',
'MEASURE' )
AND papf.person_number = '101928'
AND trunc (status.date_to) = to_date ('31/12/4712', 'DD/MM/YYYY')
--and atrb.attribute_category in( 'Overtime','Regular Pay', 'Double_Time')
AND trunc (sh21.start_time) BETWEEN trunc(:P_From_Date) AND trunc(:P_To_Date) )
GROUP BY person_number
UNION ALL
SELECT person_number,
sum(
CASE
WHEN element = 'Overtime' THEN measure
END) AS overtime_measure_hours,
sum(
CASE
WHEN elements LIKE 'Regular Pay' THEN measure
END) AS regular_measure_hours,
sum(
CASE
WHEN absence_name IN ( 'Vacation' ) THEN abs_duration
END) AS Other_amount,
max(
CASE
WHEN absence_name IN ( 'Vacation' ) THEN absence_name
END) AS Other_code
(
SELECT papf.person_number,
atrb.attribute_category element,
atrb.measure measure_hours,
rec.start_date,
rec.end_date,
abs.NAME absence_name,
abs.duration abs_duration
FROM per_all_people_f papf,
hwm_tm_rec rec,
fusion.hwm_tm_rep_atrbs atrb,
fusion.hwm_tm_rep_atrb_usages ausage,
hwm_tm_statuses status,
anc_absence_types_vl abs
WHERE 1=1
AND atrb.tm_rep_atrb_id = ausage.tm_rep_atrb_id
AND ausage.usages_source_id = rec.tm_rec_id
AND ausage.usages_source_version = rec.tm_rec_version
AND status.tm_bldg_blk_id = rec.tm_rec_id
AND status.tm_bldg_blk_version = rec.tm_rec_version
AND rec.tm_rec_type IN ( 'RANGE',
'MEASURE' )
AND papf.person_number = '101928'
AND trunc (status.date_to) = to_date ('31/12/4712', 'DD/MM/YYYY')
--and atrb.attribute_category in( 'Overtime','Regular Pay', 'Double_Time')
AND trunc (sh21.start_time) BETWEEN trunc(:P_From_Date) AND trunc(:P_To_Date)
AND abs.absence_type_id = atrb.absence_type_id )
GROUP BY person_number
Although these queries are working separately it is not working with group by on each subquery.
If I merge the two queries, the issue I am having is with Other_code & other_amount. These columns have values from two different tables.
How can I solve this?
Output should be returned for the two dates p_from_date- 01-Jan-2021 and p_to_date- 31-Jul-2021 as:
Person_Number Overtime_measure_hours Regular_Measure_hours Other_code Other_amount
101928 18 15 Double_Time 34
101928 18 15 Vacation 1
i.e. Overtime_measure_hours, Regular_Measure_hours and Other_amount should have the sum of these values.