Have you seen https://odootricks.tips/about/building-blocks/server-actions/use-server-actions-contact-customer-supplier/

You may want to know that we purposely hid these fields to make them work "automagically".

• if you create a Vendor from the Vendor Menu, it becomes a Vendor automatically

• if you create a Contact and order from it, it becomes a Vendor automatically

• if you order from a Customer, it becomes a Vendor automatically

• If you order from a Vendor every week, it will show at the top of the list.

• if you order from a Vendor once a year, it will show at the bottom of the list.

• we decreased the chances users would create duplicates after "not being able to find" records
  

I recommend you explore how it works for newly created records - using the Server Action for imported records - we have seen onboarding time and support ticket volume decrease since making these changes.  Things are 'less confusing' for Users (even though they may not be so for you!)

Hi ray:

thanks for your answer.

I understand the rank.It is tfor a customer who want to see it in the form view

I saw the server action. I can create in odoo devel mode.

How can i create then in a module?

After changing my form view it work. So I may have a xml pb.

Is there an odoo tool to validate the xml ?