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ABAP_CDS_SDL in ABAP Release 7.57 ITOC
ABAP_MODIFICATION_NN CDS Service Definition Extension>
It is now possible to define service definition extensions> in CDS SDL> using the statement EXTEND SERVICE>>.
ABAP_MODIFICATION_NN CDS Service Definition, Provider Contract>
The new statement PROVIDER CONTRACTS >> is now available for CDS service definitions>. A provider contract defines the type of service binding> that is to be used for a service definition. The effect is that stricter syntax checks are applied.