The last enum member isn't documented when using member grouping and DISTRIBUTE_GROUP_DOC.

Code sample :

/** MP format tags
 *
 * See the DC-007_E Specification.
 * 5.2.2.3  Table 3, page 13
 */
typedef enum
{
    /*MP Index IFD*/


    ///@{
    ///Mandatory
    MPTag_MPFVersion        = 0xB000,
    MPTag_NumberOfImages    = 0xB001,
    MPTag_MPEntry           = 0xB002,
    ///@}


    ///@{
    ///Optional
    //TODO : implement those tags
    MPTag_ImageUIDList      = 0xB003,
    MPTag_TotalFrames       = 0xB004,
    ///@}

    ///@{
    ///Individual image tags (attributes)
    MPTag_IndividualNum     = 0xb101,
    MPTag_PanOrientation    = 0xb201,
    MPTag_PanOverlapH       = 0xb202,
    MPTag_PanOverlapV       = 0xb203,
    MPTag_BaseViewpointNum  = 0xb204,
    MPTag_ConvergenceAngle  = 0xb205,
    MPTag_BaselineLength    = 0xb206,
    MPTag_VerticalDivergence= 0xb207,
    MPTag_AxisDistanceX     = 0xb208,
    MPTag_AxisDistanceY     = 0xb209,
    MPTag_AxisDistanceZ     = 0xb20a,
    MPTag_YawAngle          = 0xb20b,
    MPTag_PitchAngle        = 0xb20c,
    MPTag_RollAngle         = 0xb20d

    ///@}
}MPExt_MPTags;

See more on the SO question : http://stackoverflow.com/questions/29055607/doxygen-last-enum-member-not-documented