I tried to reproduce and I am not getting the same error message: “Category Expression is syntactically invalid”I have tried searching the error message but I am also not seeing it appear in other events. Can you answer the below questions: What version of assyst are you using? I have noticed there is an expression in the question, which is highlighted blue. What expression are you applying and does the error go away if it is removed? It might be worth typing in (EVENT_CATEGORY_NAME) instead of copy and pasting, just in case there is hidden characters being copied in.
From my understanding you cannot base visibility expression on the system single select field. If you try using the custom version it should work.https://wiki.axiossystems.com/assyst11-7Wiki/index.php/Expressions_and_Filters_in_assyst#The_Scope_of_Expressions
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