AR invoices and Sales Orders

SELECT ooha.order_number,
oola.line_number so_line_number,
oola.ordered_item,
oola.ordered_quantity * oola.unit_selling_price so_extended_price,
rcta.trx_number invoice_number,
rcta.trx_date,
rctla.line_number inv_line_number,
rctla.unit_selling_price inv_unit_selling_price
FROM oe_order_headers_all ooha,
oe_order_lines_all oola,
ra_customer_trx_all rcta,
ra_customer_trx_lines_all rctla
WHERE ooha.header_id = oola.header_id
AND rcta.customer_trx_id = rctla.customer_trx_id
AND rctla.interface_line_attribute6 = TO_CHAR (oola.line_id)
AND rctla.interface_line_attribute1 = TO_CHAR (ooha.order_number)
AND order_number = :p_order_number