DF 19.0

In a json file, I have node with name "login" in lowercase.
In dataflex, I create a struct with the same structure :

Struct str_manager
    String Login
    String name
    String job_description
    String phone
    String mobile
    String fax
    String email
    String language
    String status
The problem is that it's not possible to keep the word "Login" in lowercase in the struct. Dataflex changes automatically "login" in "Login" when we quit the word "login"
The result is that the key "Login" is not recognize anymore in the function JsonToDataType because it's upper/lower case sensitive