How to Make SAP Business Partner Entity Object Page Editable

[hoandreasm]

Hi,

I created a Fiori List Report Page with my CAP project which use the SAP S/4HANA Business Partner (A2X) BusinessPartner Entity, and it connects to our backend service.

I managed to get the data when querying to backend via the provided API GET /A_BusinessPartner, like this screenshot below:

 But when I click one of the line, and go to the Object Page:

There's no edit button.
I get it, it needs the @SAP.updatable field needs to be true for every properties.
Since the generated cds file from the OData edmx file from the website: https://api.sap.com/api/OP_API_BUSINESS_PARTNER_SRV/overview is defaulted to false, how do I make this Object Page editable and able to hit the provided PATCH API?
Is there any way to make the Object Page editable without much workaround or just by using the same entity or tweak the entity?

Do you have any suggestions @gregorw?

Regards,
Andreas

[MioYasutake]

@hoandreasm 

Here is a link to a similar question to yours.

https://community.sap.com/t5/technology-q-a/cap-application-with-external-api-on-btp/qaq-p/13959181