SAP C0 CONTRACT RULES CDS

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C0 Contract Rules for CDS Entities
Currently, CDS view entities, CDS projection views CDS abstract entities, and CDS custom entities can be released with a C0 contract for extensibility.
The following topics list the most important C0 contract rules for CDS entities.
SUBNODES
The general rules for CDS entity extensions are described in the topic CDS Entity Extension.
In ADT, a CDS object can be released under the C0 contract for use in Cloud development. To release a CDS object under the C0 contract for use in key user apps, use transaction SCFD_REGISTRY. C0 release for key user apps done in transaction SCFD_REGISTRY are visible, but not changeable, in ADT.