I am facing a serious issue is BIDS.
I have configured a Un-Pivot transform, source to unpivot is sort, when I change the source to derived column (one column name is same for both) and try to open Unpivot it gives me unreferenced lineage id (this is correct). Now When I select Delete Unreferenced Lineage Column and select Apply , it works till here. As soon as I select OK, BIDS crashes and closes.