Can you provide more information?

I cannot find any place in the could where this error could occur.

Is it still in Build 100?

Can you provide more information?

I cannot find any place in the could where this error could occur.

Is it still in Build 100?

The problem is in the following method:
public ItemResult[] AddItems(Item[] items)
(OpcCom.Da.Subscription.AddItems(Opc.Da.Item[]))
m_items contains only created (ResultID.Succeeded()) items.
At the end of the method there is:
lock (m_items)
{
return (ItemResult[])m_items.ApplyFilters(m_filters, results);
}
Filters are applied, but only for items added to m_items (see the following snippet from ApplyFilters)
ItemIdentifier itemID = this[result.ClientHandle];

if (itemID != null)
{
result.ItemName = ((filters & (int)ResultFilter.ItemName) != 0)?itemID.ItemName:null;
result.ItemPath = ((filters & (int)ResultFilter.ItemPath) != 0)?itemID.ItemPath:null;
result.ServerHandle = result.ClientHandle; result.ClientHandle = ((filters & (int)ResultFilter.ClientHandle) != 0)?itemID.ClientHandle:null; //if added returns correct handle.

}

I hope it helps.

Fixed in Build 101 by moving the client handle assignment outside of the result id success check.

// save client handle.
results[ii].ClientHandle = items[ii].ClientHandle;

// add new item table.
if (results[ii].ResultID.Succeeded())
{
lock (m_items)
{
m_items[definitions[ii].hClient] = new ItemIdentifier(results[ii]);
}

// restore internal handle.
results[ii].ClientHandle = definitions[ii].hClient;

}