the first occurrence of a payment default on any financial obligation, rated or unrated, other than a financial subject to a bona fide commercial dispute; an exception occurs when an interest payment missed on the due date is made within the grace period

关于违约的定义: 任何债务的第一次违约支付，无论是定价的还是非定价的，区别于善意商业纠纷的金融主体; 在截止日期之前未能支付利息但是在宽限期内支付的异常