Aggregated List (complex union)

Our application creates a budget for a project. Since the project can have multiple phases or areas, it compiles a master list of materials where the items are broken out by phase so that the budget can be easily reviewed. For simplicity in ordering materials, I need to aggregate the list and eliminate duplicates. I created a non persistent entity and copied only the item names from the master list to the entity. When I union the non persistent list against itself, the duplicates are not eliminated...?? Does list union not work on non-persistent data? Thanks
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