SSIS Merge Join: Delete does not work

I've set up a Data Flow Task to sync a flat file with its destination table using a Merge Join with a Left Outer Join as described here (and elsewhere ). **Merge Join**: Inserting and Updating works fine, however, deleting a record from the flat file does nothing. I guess it's something with the **Conditional Split**: delete ISNULL(gid_csv) && !ISNULL(gid) or the following SQL Command: DELETE FROM dbo.gusers WHERE gid = ? The OLE DB Source and the three destinations are accessing the same table. What do I miss?