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I suggest activating each occurrence and call the UI command to Undo Checkout like this

{
    Inventor.Application mApp = ThisApplication;
    Inventor.ControlDefinition mControlDef;
    mControlDef = mApp.CommandManager.ControlDefinitions.Item("VaultUndoCheckoutTop");
    mControlDef.Execute2(true);
}

 



Markus Koechl

Solutions Engineer PDM, Autodesk Central Europe