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1. Create newLoanApplication schema. 2. Create newPurchaseOrder schema. 3. Import newLoanApplication to newPurchaseOrder. 4. In newPurchaseOrder -> Referenced Schemas, copy import node. 5. Paste on Referenced Schemas. Result: 2 same imports in Referenced Schemas. At the same time, duplicating imports is prohibited in Add -> Import dialog.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss