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形式發票可以增加傳送電子郵件按鈕嗎
可以，详情请参考 Sale order 的 Send By Email 按钮
還是不太懂
看代码，sale_view.xml和sale.py，查找action_quotation_send，实际上，发票在待支付的状态下，已经有“以邮件发送的功能”，可以通过设置，邮件，模板修改发送形式发票的模板
