A bug in OpcCom.Da.Subscription.RemoveItems.

Fixed with the following code:

// process results.
IdentifiedResult[] results = new IdentifiedResult[itemIDs.Length];

ArrayList itemsToRemove = new ArrayList(itemIDs.Length);

for (int ii = 0; ii < itemIDs.Length; ii++)
{
results[ii] = new IdentifiedResult(itemIDs[ii]);

results[ii].ResultID       = OpcCom.Interop.GetResultID(errors[ii]);
results[ii].DiagnosticInfo = null;

// flag item for removal from local list.
if (results[ii].ResultID.Succeeded())
{
    itemsToRemove.Add(results[ii].ClientHandle);
}

}

// apply filter to results.
lock (m_items)
{
results = (IdentifiedResult[])m_items.ApplyFilters(m_filters, results);

// remove item from local list.
foreach (int clientHandle in itemsToRemove)
{
    m_items[clientHandle] = null;
}

return results;

}

Will be part of Release 2.00.101