基本案情 1996年3月1日,上海甲公司以上海乙公司为收款人,签发商业汇票一张,汇票金额为100万元人民币,汇票到期日为1996年7月31日。乙公司在接到该商业汇票后,将该汇票背书转让给浙江丙公司。此后,江苏丁公司、上海戊贸易公司和上海××区自来水公司亦依次通过背书转让方式取得了该商业汇票。同年8月1日,上海 Basic case On March 1, 1996, Shanghai Company A, Shanghai Company B as the payee, issued a commercial draft, the amount of bill was 1 million yuan, the draft due date is July 31, 1996. Upon receipt of the commercial bill, Party B will transfer the endorsement of the bill of exchange to Zhejiang C Company. Since then, Jiangsu Ding Company, Shanghai E Trading Company and Shanghai XX District Water Company have also obtained the commercial draft by endorsement transfer. August 1 the same year, Shanghai