通过调查和与企业相关专业人员的沟通，要求系统具有以下功能：

1. 系统操作简单、便捷，界面简洁、友好。

2. 具有规范、完善的基础信息设置和管理。

3. 支持多人操作，要求有用户和权限分配功能。

4. 对销售信息提供销售功能。

5. 支持销售退货和入库退货功能。

6. 支持库存价格调整功能。 -Through surveys and communication with business professionals, the system has the following features:

(1) the system is simple, convenient, simple, friendly interface.

(2) specification, the basis of information set up and manage.

Support the people operating the required users and assign permissions functions.

Sales information to provide a sales function.

Support sales return and storage of the return function.

Support the stock price adjustment function.