Configuration File - Erroroneous Module Qualification Required Suggestion Follow

I am getting what I believe to be an erroneous suggestion from Resharper in my Web.config file in regards to the attribute value of a custom configuration section element.



The ThumbnailResolutionElement defined in my application has the "type" attribute set to an Enum value so the  value in the attribute should be a string representation of the enum value and nothing more.

public class ThumbnailResolutionElement : ConfigurationElement
{
    public ThumbnailResolutionElement(ImageResizer.ThumbnailType type, int height, int width) {
        Type = type;
        Height = height;
        Width = width;
    }

    public ThumbnailResolutionElement() { }

    [ConfigurationProperty("type", IsRequired = true, IsKey = true)]
    public ImageResizer.ThumbnailType Type {
        get { return (ImageResizer.ThumbnailType)this["type"]; }
        set { this["type"] = value; }
    }

    [ConfigurationProperty("width", IsRequired = true, DefaultValue = 280)]
    public int Width {
        get { return (int)this["width"]; }
        set { this["width"] = value; }
    }

    [ConfigurationProperty("height", IsRequired = true, DefaultValue = 280)]
    public int Height {
        get { return (int)this["height"]; }
        set { this["height"] = value; }
    }
}

public static class ImageResizer
{
    public enum ThumbnailType
    {
        /// <summary>
        /// Original Image
        /// </summary>
        FullSize = 0,

        /// <summary>
        /// 115px x 115px
        /// </summary>
        SearchSmall = 1,

        /// <summary>
        /// 160px x 160px
        /// </summary>
        SearchBig = 2,

        /// <summary>
        /// 30px x 30px
        /// </summary>
        DetailsSmall = 3,

        /// <summary>
        /// 75px x 75px
        /// </summary>
        DetailsMedium = 4,

        /// <summary>
        /// 280px x 280px
        /// </summary>
        DetailsBig = 5,
    }
}