The following lines contain the word 'select', 'insert', 'update' or 'delete':
SELECT ac.check_number,
ac.check_id,
ac.check_date,
ai.invoice_num,
ai.invoice_id,
aip.accounting_date,
aip.invoice_payment_type,
alc1.displayed_field,
ac.payment_method_lookup_code,
alc2.displayed_field
FROM ap_invoice_payments_all aip, --ap_invoice_payments
ap_checks_all ac, --ap_checks
ap_invoices_all ai, --ap_invoices
ap_lookup_codes alc1,
ap_lookup_codes alc2
WHERE aip.invoice_id = l_invoice_id
AND aip.payment_num = l_payment_num
AND aip.check_id = ac.check_id
AND aip.other_invoice_id = ai.invoice_id (+)
AND alc1.lookup_type = 'NLS TRANSLATION'
AND alc1.lookup_code = 'PREPAY'
AND alc2.lookup_type = 'PAYMENT METHOD'
AND alc2.lookup_code = ac.payment_method_lookup_code;