The Design time of the Draft handling is what developer needs to implement whereas the Runtime is handled by the framework.
In this video, I have explained how to define the draft handling for an Business object with Odata Version 4.
Watch Part 1 - Overview of Draft handling - • Overview of Draft Handling & Why do we nee...
Watch Part 2 - • What is Draft Design Time & Draft Runtime ...
SAP RAP playlist - • Managed Restful ABAP Programming Model (RAP)