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C1 Contract Rules for Providing CDS Entities

A provider of ABAP CDS objects must obey the following rules:

• CDS Entities
  • Only CDS DDIC-based views (obsolete), CDS view entities, CDS projection views and CDS abstract entities can be released with a C1 contract.
  • The usage of upper and lower case in the name of an entity, its associations, elements or parameters must not be changed.
  • The client handling must not be changed.
  • Being a RAP BO root entity of a RAP BO cannot be undone.
  • Only annotations can be used that are allowed by the annotation @CompatibilityContract.rc.usageAllowed in their definition. Changes to annotations are also governed by its definition.
  • Parameters must not be removed from or added to the parameter interface.
  • Associations to a released target data source must not be removed and the target data source must not be exchanged.
  • No implicit SELECT list * is allowed.
  • Only positions of non-key elements can be changed if allowed by the data category.
  • Only non-key elements can be added.
  • Changes to the elementary data types of elements and parameters are allowed but must follow the rules for elementary data types.