OneToOne_noInv.cs

    var db = new SQLiteConnection(new SQLitePlatformAndroid(), Constants.DbFilePath);
    db.CreateTable<Vehicle>();
    db.CreateTable<RegistrationCertificate>();

    var vehicle = new Vehicle
    {
        Brand = "Renault",
        EngineCapacity = 1.9m,
        ProductionDate = new DateTime(2001, 01, 01)
    };

    var certificate = new RegistrationCertificate
    {
        RegistrationNumber = "AB 12345",
        OwnerData = "Dawid Sibiński",
        VIN = "1312BS1312ASDSSVVW"
    };

    db.Insert(vehicle);
    db.Insert(certificate);

    vehicle.RegistrationCertificate = certificate;
    db.UpdateWithChildren(vehicle);

    var vehicleStored = db.GetWithChildren<Vehicle>(vehicle.Id);