This issue has been explained in this thread.
As explained in some documents on the NI web site
the Network Variable Library can be used to develop an OPC Server (and a Client too).
While developing an OPC Client, the function CNVGetDataQuality( ) can be used to read the data quality, but there isn't a way to set this parameters while developing an OPC Server.
For this reason a way to set the data quality status and substatus should be added to the Network Variable Library functions that generate OPC data.
I suggest these new prototypes:
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