# SAP CRM的订单模型移植到S/4HANA之后，到底做了哪些改进？

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One order model consists of a series of objects with two different types:

(1) extension: data segments which exclusively belong to the header or to an item. We therefore distinguish header extensions and item extensions.

(2) set: a collection of data which can be linked to the header OR to an item of the transaction.

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windows server 2008阿里云ECS服务器安全设置

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