The following lines contain the word 'select', 'insert', 'update' or 'delete':
SELECT closed_ind
FROM IGS_CO_S_LTR
WHERE correspondence_type = p_correspondence_type AND
letter_reference_number = p_letter_reference_number;
SELECT 'x'
FROM IGS_CO_S_LTR sl
WHERE sl.correspondence_type = p_correspondence_type AND
sl.letter_reference_number = p_letter_reference_number AND
sl.s_letter_reference_type = p_s_letter_reference_type;