Hi Khofifah,
Complementing Joao´s answer. RestrictCharsType as I saw in your model is a static entity.
In mobile side you can use directly only the references for this kind of statics, as Entities.RestrictCharsType.XXX , but the method to Get an Element from them is not available. This is because data fetch on mobile side is asynchonouns and needs to be done using Fetch from Database as João said.
If you need access this data when offline, you can create an local entity for this RestrictCharsType and synchonized it before use in your app.
Best Regards
Fabio Fantato