Custom UIBB data - save into database tables

Hello experts ,

Could you please let me know what method I need to follow to save my custom UIBB staging data to active area (database table)

I have created two custom list UIBB, I am able to  save the date into staging tables when ever CR gets saved . But I want push the same data to database tables ( ex : data has to store into table KNVD  )once the change request gets approved .

I am trying to with the below options not sure if I am doing correct approach or not

Really appreciate your guidance

1. 1) Created the custom class with the interface as IF_USMD_PP_ACCESS , and maintained this class into data model  for a custom active area .  Maintain the active area name to entity ( I have entity type 4 ) – planning to redefine the method SAVE (IF_USMD_PP_ACCESS ) , --is this right approach ?
2. 2) I am following the how to document  --(  Extend the MDG Business Partner – Node Extension (Reuse Option) where they explained to create custom handler class  - Is this right approach ?

Thank you