Hi Dirk,
Are you pointing to this----- each update row will actually cause two output rows, the insert row with the after image values as the new version and an update row with the before image values to modify the oldest record's currentflag and/or end-date----
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As in that case History preserving transform will compare the after image and before image. i am not able to get clear idea regarding before image data where does it get the before image data from.(By which target reference it is going to compare ----it must be either table comparison or some other )
