The following lines contain the word 'select', 'insert', 'update' or 'delete':
select round((x_amount/rate.denominator_rate)*rate.numerator_rate,2),
rate.conversion_status_flag
into
l_converted_amount,
l_converted_status
from as_period_rates rate,
as_period_days day
where rate.from_currency=x_from_currency
and rate.to_currency=x_to_currency
and day.period_name=rate.period_name
and day.period_set_name=l_period_set_name
and day.period_type=l_period_type
and day.period_day=trunc(x_conversion_date);