my $credit_start = $start ? "AND cust_credit_refund._date <= $start" : '';
my $credit_end = $end ? "AND cust_credit_refund._date > $end" : '';
my $pay_start = $start ? "AND cust_pay_refund._date <= $start" : '';
my $credit_start = $start ? "AND cust_credit_refund._date <= $start" : '';
my $credit_end = $end ? "AND cust_credit_refund._date > $end" : '';
my $pay_start = $start ? "AND cust_pay_refund._date <= $start" : '';