System should allow document or part subtype to have its own number uniqueness. On the document side for instance, different organizations (with different document types) may all have fully numeric numbers. To handle this in WIndchill, we need to com up with a prefix for number, which kills all historical records and links to other systems. ON the part side, we may have internal part numbers, National Stock Numbers (NSN's), ERP Stock Numbers, APL's, RICs, GUCL, etc that all use the same numbering system. Part SubType (and children) should provide their own part number uniqueness as a checkbox.