AX / D365FO : Error : Natural key was not found for a custom table during entity creation

I am creating a new entity from a newly created custom table then i am getting an error ” Natural key  for the table TestEntityTable was not found”.

The problem is that the table uses RecId as its primary index, and the Data Entity Wizard doesn’t support tables with a RecId-based primary key. 

To solve I just need to create a new unique index and set :

•  index property “Alternate Key = Yes” and Allow Duplicate = No