This must be either 5148 to apply the ECO item to an ECO header, or 329 to apply the ECO item to a part revision.
'Declaration
<PropertyBitValueAttribute()> Public Property AppliesTo As EcoItemAppliesTo
[PropertyBitValueAttribute()] public EcoItemAppliesTo AppliesTo {get; set;}
Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family