Mendix OPC UA Communicate with Prosys OPC UA Server

I use the OPC UA  Client conncect module to do the OPC UA communicate with Prosys OPC Server, it can connect to OPC server successfully, but can not read and write the OPC nodes.  the problem is as below showing   when I use other client tools, it can read and write the OPC server nodes.  when I  use python programing a OPC Server side for testing.  Mendix can connect with the OPC server succuss and write the vulue to the OPC node also , but can not read.   who can give some help, thank you.
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