SADL vs Local Annotation
Advantages of SADL
- Annotation and data stay together
- Syntax is simple
- Reusable
Advantage of Local Annotation
- More flexible
- Can handle complex annotation which is not bound to a single field or entity
- Vocabulary list update faster than CDS annotation
- Can override CDS Annotation
UI annotations in CDS view can be translated to OData annotation by SADL framework, but they are not 100% the same and have their own advantages.
Choose the correct method of Annotation
Use SADL
- write annotation for the entire view
- write annotation for one field
- data intensive logic, ex ValueHelp
Use Local Annotation if
- Complex annotation not associated to particular field (ex UIFacets )
- the annotation you want to use is not supported by current ABAP version
- Backend server is not ABAP server ( ex. AS Java, HANA )