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I would say that you don't get an error as the "The time to wait" entry field for a Wait Step is expecting an Expression rather than simply a numerical value and 2,5 is an expression without errors. After that it is down how the expression entered is processed by SyncSteps.dll. I guess SyncSteps.dll crunches the expression entered looking to extract a numeric value and the current implementation is to return the last value for a CSV list.