Hi,

Can you please provide the code snippet here.

One more thing please try to cast the values of your SelectionFactory into a string if it is of another type.

var selectableCategories = GetCategoriesWithChildren(categories,str, strings, list)
                .Select((x, i) => new SelectItem
                {
                    Text = strings[i],
                    Value = x.ID.ToString()
                });

I have this in the selection factory;

public IEnumerable<ISelectItem> GetSelections(ExtendedMetadata metadata)
        {
            var selectList = new List<ISelectItem>();
            foreach (var colorTheme in colorThemes)
            {
                selectList.Add(new SelectItem() { Text = colorTheme.Name, Value = colorTheme });
            }
            return selectList;
        }

It is used on the model as;

        [Display(
            Name = "Color Theme",
            Description = "Select the color theme to be used on the banner",
            GroupName = TabNames.Content,
            Order = 4)]
        [Required]
        [CultureSpecific]
        [SelectOne(SelectionFactoryType = typeof(ColorThemeSelectionFactory))]
        [BackingType(typeof(PropertyColorTheme))]
        public virtual ColorTheme ColorTheme { get; set; }

With the ColorTheme class, that holds a few different fields, and the backing type of PropertyColorTheme that extends PropertyData
It saves internally using the propertyDataType.String, using custom parser that just takes the values of the ColorTheme as a comma seperated string

Include value string?