The following lines contain the word 'select', 'insert', 'update' or 'delete':
SELECT 1
INTO dummy
FROM DUAL
WHERE not exists (SELECT 1
FROM po_rfq_vendors
WHERE po_header_id = X_po_header_id
AND sequence_num = X_sequence_num
AND ((X_rowid is null) or
(X_rowid != rowid)));
SELECT nvl(max(sequence_num),0)
INTO X_max_sequence_num
FROM po_rfq_vendors
WHERE po_header_id = X_po_header_id;