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The way to do this is to add and error or warning to the TransactionResult object in one of the event handlers, OnValidateControlEventHandler, OnValidateScreenEventHandler or have a rule raise an error or warning event. Throwing exceptions is not supported in event handlers.
That is true. but I want to show the cause of error on screen without any opa control on it. The transactionresult error shows the error on the top of the screen.