Determination on save in Behavior Definition | RESTful ABAP Programming Model (RAP)

Determinations in RAP helps us to derive new value of the Business Object column from dependent another columns.
There are two types of determination in BDEF,
Determination on Save - Executes at the save sequence phase
Determination on Modify - Executes at the Interaction phase
00:10 - What is Determination ?
01:50 - Examples
04:15 - Modification to Existing data model of Task application
05:10 - Demo - what we are going to determine ?
08:00 - Define Determination at Header Business Object
12:58 - Define Determination at Item Business Object
29:00 - Final Demo
Validation on Save part1 - • What is Validation on ...
Validation on Save part2 - • What is Validation on ...

[@trimbandaru1767]

Very in-depth material so far I found online. Thank you.
can you please share the github repo for these demo code?

[@muthu_cloud]

Thanks, Unfortunately I haven't uploaded the source code