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this applies to Ens.MessageHeader as well. The code is mapped to EnsLib which is normally mounted read only.

I think Tunetable is trying to update the class definition.

I can't remember if it has always behaved like this
 

the problem with stats and studio deployed classes goes away  in a more recent release (2020 perhaps).

Lorenzo

Two guesses - 

First, check that the task 'Update SQL query statistics' is running and that you have waited long enough for the task to run.

Second, are you looking at a query that is embedded SQL in a 'deployed' class (meaning there is no source code)? There is a problem with statistics for deployed classes, but I don't remember if it matches your situation exactly.

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