The following lines contain the word 'select', 'insert', 'update' or 'delete':
SELECT r.name
INTO flex_context
FROM ra_batch_sources r,
pa_implementations p
WHERE p.invoice_batch_source_id = r.batch_source_id;
select 'x'
from dual
where exists (
select 'x'
from pa_draft_invoices di
where di.system_reference = p_customer_trx_id
);