Detailed design of the administrator login modules, customer information management module, vehicle information management module and invoice management modules.

详细设计管理员登录模块、客户信息管理模块、车辆信息管理模块和发货单管理模块。

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The customer claims that a mistake was made in the calculation of his invoice.

客户指称，他的货单有一处计算错误。

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When, for example, a user creates an invoice for a customer without an ID number, most applications reject the entry.

例如，当用户创建一张没有顾客号码的发货单时，多数程序会拒绝输入。

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If the customer accepts the free trial it is added to their invoice and only mentioned again if the customer says something.

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