How can i save player inventory in UFPS with Easy Save?

Hi everyone, I'm beginner in c#. I use easy save and UFPS. I have a problem about saving inventory. UFPS users know, player inventory has a item records, item caps etc.. My problem is, i can't save item record when i change this area. I have searched web but all tutorials and examples are saving int, bool, string etc.. i can't find an example which shows how to save itemType or gameobject with scripts.

Maybe my problem is very easy for programmers but i don't know c# very much. The people who i have asked, gave short answers like do this, do that or try this, try that. Can anybody give me a detailed solution?