Improve the data table for "Map" type Structures

Unfortunately, when you create a Data Table of a structure that contains a variable of type “Map”, and when you want to click on “Add element” then it indicates the message: “Cannot add a new key to the map while a key with the same value exists”

So you have to alternatively create an additional enumeration to get around the error, which is annoying

Please, add the possibility to correct this

Thank you