If the ChartTextAppearance is assigned Item WildCards (ItemWildCard.Row or ItemWildCard.Column), then it will always match given data points at the wildcarded row or column (or both, if applicable).
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2