Nesting
An inner or child development component (DC) always belongs exclusively to the enclosing or parent DC. This implies that a component cannot be the child DC of two different parent DCs at the same time. The nesting of DCs also influences the use of the public parts.
An inner DC may be further decomposed into DCs, which allows you to build component hierarchies of arbitrary complexity. A DC that is not enclosed in any other DC is called a top-level DC . The figure below shows the inner structure of a DC.
Change of the Enclosure Relations
The inclusion relations between DCs are not static and may change over time. A DC may become an included DC, or an included DC may lose its enclosing DC.
Changing an enclosure relation is not supported in the SAP NetWeaver Developer Studio.