On the General Options settings on the Properties tab in the session properties, define the Treat Source Rows As option as Data Driven. If you do not choose Data Driven, the Integration Service flags all rows for the row type you specify in the Treat Source Rows As option and does not use the Update Strategy transformations in the mapping to flag the rows. The Integration Service does not insert and update the correct rows. If you do not choose Update as Update, the Integration Service does not correctly update the rows flagged for update in the target table. As a result, the lookup cache and target table might become unsynchronized.