Hello
I have created following Entity:

When creating this Entity, I defined RecId as being the Primary Key.

I then use a Data Integration project from D365FO to CDS to populate this Entity

Customeraccount is a unique identifier of a customer.
Problem is than every time I run the integration project, It add new lines. as I a result, I get duplicate customers in my table.
When exploring further, I found something a bit weird in my entity definition (see below). I would have expected my RecId field to be set a Primary Key.
I tried creating again the entity, but it always create a Primary key field different than the one I set in the Entity creation form

Please advise if/what I am doing something wrong
Thank and Regards