BI4OAE 发现换卡里面，和有些ham交换了，后来忘记了，又点一次，又发出去换卡申请了，这个可以添加一个限制吗？一个是记录重复，另外一个也是太乱，万一再发一次，又浪费资源 比如 两个用户之间 只能有一条换卡记录 谢谢 @BG5UWQ
BH7HQT +1, The history of card exchanges doesn't seem to have any effect at all; at least it doesn't provide information about the last time I agreed to exchange cards with another station using the same callsign.
BH2VYJ Indeed, when you click, a pop-up message may appear asking if you still want to proceed with the exchange with XXX on X month of X year. In this case, you can click "Continue" to try again, or click "Cancel" to stop changing cards.
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