Hi,
I am currently practicing on ABAP CDS view and BOPF. If you can access SAP wiki page, you can search "how to implement savedraft", which generates BOPF based on ABAP CDS view, then create Consumption View based on BOPF CDS view, finally generate OData based on Consumption view. Actually you will call "Function Imports" to do the CUD operations.
Please note that you need to understand VDM CDS model.
I am not expert, still something is not clear for me. if any question, please let me know.
Rui Zhou