In "AddItems" method of "OpcCom.Da.Subscription", item handles delivered by clients are translated to internal handles (starting from 1 and increased by 1 for each item), and after "((IOPCItemMgt) m_group).AddItems" call "m_items" table is initialized with the item handles delivered by client.

Problem occurs if a data change callback comes from server before/during "m_items" initialization. Callback is executed and client receives server handles from net api in data changed callback. (our client's item handles are starting from 0 and increased by 1 for each item and this is the cause of the shift on display)

Here are the steps to reproduce the problem:

• Create and activate subscription for many DA items with client handles starting from 0 and increased by 1 for each item

• Place a breakpoint in "OpcCom.Da.Subscription.AddItems" right after "((IOPCItemMgt) m_group).AddItems" call

• Wait a few seconds, then remove breakpoint and continue execution (in this time interval data change callback from the server will be executed by .NET API, and results will be delivered to client)

• Observe data changed client handles on the client (internal NET API item handle values should be observed here - starting from 1 and increased by 1 for each item)