mbdavid/LiteDB

Hi all i have a question about correct mapping of a class that include a list of a custom class. All data besides the list is stored correct and i can also load it back. is there a special mapping needed? My class looks like this:

[BsonId]
public Guid ID { get; set; } = Guid.NewGuid();
public int CardType { get; set; }
public String Cardname { get; set; }
public int Rack { get; set; }
public int Level { get; set; }
public int Field { get; set; }

    [BsonRef("Articledata")]
    public List<Articledata> CardItems = new List<Articledata>(4);

public class Articledata
{
public int Pos { get; set; }
public String Title { get; set; }
public String Text { get; set; }
public String Description { get; set; }
public String Manufacturer { get; set; }
public String OrderID { get; set; }
public String Picturepath { get; set; }
public String Color1 { get; set; }
public String Color2 { get; set; }
public DateTime Insertdate { get; set; }
public DateTime Expiredate { get; set; }
public float Amount { get; set; }
public float Amountwarning { get; set; }

}

saving like:
public void InsertAVSCARDIntoLightDB(AVSCard Card)
{
string path = Configuration.getDefaultDirectory_online();
path += "AVSCard.db";
// Open database (or create if doesn't exist)
using (var db = new LiteDatabase(path))
{
// Get a collection (or create, if doesn't exist)
var col = db.GetCollection<AVSCard>("AVSCard");

            col.Insert(Card);

        }
    }

loading:

    public void LoadAVSCaardsFromDB()
    {
        list_litedb_cards.Clear();
        list_litedb_cards = new List<AVSCard>();
        string path = Configuration.getDefaultDirectory_online();
        path += "AVSCard.db";

        using (var db = new LiteDatabase(path))
        {
            // Get a collection (or create, if doesn't exist)
            ILiteCollection<AVSCard> db_avscards = db.GetCollection<AVSCard>("AVSCard");

            foreach (var item in db_avscards.FindAll())
            {
                list_litedb_cards.Add(item);
                l_all_card.Add(item);                
            }
        }            
    }