I inadvertently ran a quest twice which gave a weight reducing bag as a reward. I cannot accept the second (it is lore) but there seems no way to clear it from the quest reward dialog. Do I need to empty the original, delete it and then get the duplicate. Seems a bit odd not to have a "not wanted" button on the rewards dialog.
Yeah this is a pita. But you have the answer, empty it then delete it then you can get the other one. There are other quest rewards you will run into on this issue - like augs and stuff.
Check the item info, if it is Lore but still tradable you can put it in your shared bank or give it to another character, a friend or box. If it is Lore and No Trade but also marked Heirloom, you can still put it in your shared bank to give other characters on that account.