If you want to make a Scripttask filtering rows, means skip rows on defined properties, you have to use the OutputBuffer Property (from the synchronized Buffer) ExclusionGroup and set this to an non zeror value. Doing so, only rows will tranfered to the output, if you explicit call Row.DirectRowToOutput(). This method is only available, if ExclusionGroup is set to a non zero value. This may be suitable for Converters and Consisty Checks, where you must filter out rows with inconvertable values and rows which doesn't match consitity Rules.