Query : To validate whether a transaction's REC is equal to its REV plus TAX or not

SELECT c.trx_number, c.complete_flag, c.customer_trx_id,
a.customer_trx_line_id,
(SELECT payment_schedule_id
FROM ar.ar_payment_schedules_all d
WHERE a.customer_trx_id = d.customer_trx_id) payment_schedule_id,
(SELECT receivable_application_id
FROM ar.ar_receivable_applications_all e
WHERE a.customer_trx_id =
e.customer_trx_id)
receivable_application_id
FROM ar.ra_customer_trx_lines_all a,
ar.ra_customer_trx_lines_all b,
ar.ra_customer_trx_all c
WHERE c.set_of_books_id = '&sob'
AND a.customer_trx_id = c.customer_trx_id
AND a.set_of_books_id = '&sob'
AND a.set_of_books_id = b.set_of_books_id
AND a.customer_trx_line_id = b.link_to_cust_trx_line_id
AND a.revenue_amount <> b.taxable_amount
AND EXISTS (
SELECT 'T'
FROM ar.ra_cust_trx_types_all rctt
WHERE rctt.post_to_gl = 'Y'
AND rctt.set_of_books_id = c.set_of_books_id
AND rctt.cust_trx_type_id = c.cust_trx_type_id
AND rctt.end_date IS NULL)
AND EXISTS (
SELECT 'T'
FROM ar.ra_cust_trx_line_gl_dist_all rctlg
WHERE rctlg.set_of_books_id = c.set_of_books_id
AND rctlg.customer_trx_id = c.customer_trx_id
AND rctlg.gl_date >= SYSDATE - 31)