When adding points to your OPC Client from a Schneider Electric Vista OPC Server that contains points from Xenta Servers error "The item definition does not conform to the server syntax".
Vista OPC Server 1.6.x
Xenta Server 511-B, 731, 527, 913
There are certain characters that are invalid in an OPC Server environment which are allowed in the Vista Server database.
Invalid names include I/NET, RS232/485 A, and TCP/IP.
Create a folder in the Vista database and create shortcuts for the points that are suffering this problem. This avoids any invalid characters, but grants full functionality for the data in question.
For more OPC Server issues please see Lessons Learned Article #4333: Vista OPC Server Installation and Known Issues.