We can check the workflow status from back end also for Header or Line with below query.
SELECT wias.item_key,
SELECT wias.item_key,
wpa.activity_name,
wias.activity_status,
wias.activity_result_code,
wias.assigned_user,
wias.begin_date,
wias.end_date
FROM WF_ITEM_ACTIVITY_STATUSES
wias, WF_PROCESS_ACTIVITIES wpa
WHERE wias.process_activity
= wpa.instance_id(+)
AND wpa.process_item_type = wias.item_type
AND wias.ACTIVITY_STATUS = 'ERROR'
AND wias.end_date IS NULL
AND wias.item_key = TO_CHAR (12345) -- Header_id or Line_id
ORDER BY begin_date DESC