Set the value of a Keyed object

Hi All,

I’m using an keyed object to store user’s preferences.
The keyed object is created by a Server Connect.
I can READ values using this syntax prefs_array.value.BOOKS_EMP for example.
But i do not figure out how to SET a value. I tried prefs_array.value.BOOKS_EMP.setvalue() but it doesn’t works.

How to do it ?

Thx