need a query to get the unit price of subscription invoice

Summary: need a query to get the unit price of subscription invoice

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currently we are using but we are getting wrong value for one invoice

select (SELECT to_char(obla.adjustment_amount, 'fm9,999,999,900.00999')
FROM ra_customer_trx_all rac,
oss_bill_lines obl,
ra_customer_trx_lines_all racl
oss_bill_adjustments oba
WHERE 1 = 1
AND rac.customer_trx_id = c.customer_trx_id
--AND rac.trx_number = '26502450091'
AND racl.customer_trx_id = rac.customer_trx_id