SAP产品总的extensibility扩展原理介绍：
看Jerry这篇文章。
SAP Cloud for Customer Extensibility的设计与实现
我的同事Boris写的。
而本文是S/4HANA extensibility扩展性专题：
Enhancement Concept
SCFD_REGISTRY - Extensibility Registry Business Context
Extensible CDS View
Extension field is available, extend view generate, on registered CDS view.
Extensible OData Model
Data Transfer and Business Scenario
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