Core banking is expanding the customer address field from 35 to 70 characters. We have 200,000 customers; after the change about 8% will have addresses longer than 35 characters and 2% longer than 50. Four downstream systems use this field: the CRM supports 100 characters, the data warehouse 70, the sanctions screening interface 50, and the statement print file is fixed at 35. Which ones break, and which would you fix first?

核心系统要把客户地址字段从 35 个字符扩到 70 个。全行 20 万客户，扩完后约 8% 的地址超过 35 个字符，2% 超过 50 个。下游四个系统用这个字段：CRM 支持 100，数据仓库 70，制裁筛查接口最多 50，对账单打印文件固定 35。哪些会出问题，你先处理哪个？