Hi Shaishav,

Thanks for input, gave me the direction i needed to fix my solution. For anyone insterested, here is how i am getting the preValues from a list of selected item(s), needs to be made more general but hopefully gives people an idea.

protected string GetSelectedPreValue(string dataTypeId, string selectedItem)
        {
            var selectedValue = GetDataTypeSelectedPreValues(dataTypeId, new List<string> { selectedItem })
                .Select(x => x.Value)
                .FirstOrDefault();

            return selectedValue;
        }
protected string GetSelectedPreValues(string dataTypeId, List<string> selectedItems)
{
    var selectedValues = GetDataTypeSelectedPreValues(dataTypeId, selectedItems)
        .Select(x => $"'{x.Value}'");

    return $"[{string.Join(",", selectedValues)}]";
}

protected List<ValueListItem> GetDataTypeSelectedPreValues(string dataTypeId, List<string> data)
{
    var typeId = Guid.Parse(dataTypeId);
    var documentType = _dataTypeService.GetDataType(typeId);

    return documentType.GetSelectedPreValues(data).ToList();
}

`