Well I forgot to take the screenshot, but I can recall some details. It was smelted iron which I got from looting a tomb in France. After returning, I felt a need to get a harvester, so my sim went to consignment store. From there, I got the idea to sell the two extra bottles of nectar my sim had in his inventory. After opening the consign list, I saw smelted iron in the list too, but could not select it and press consign button. I tried very hard to sell, but it could not be sold other than from inventory or buy/build mode.
Not only iron, but many inventions and other sell-able things didn't select in the consign list. Some of them even hid from the list.
I have not tried since then, because it was probably a bug. Hundreds of people have bugs, glitches and problems with the consignment store. Maybe I am one of them too.
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Back on topic: So do you know any good back-alleys in Bridgeport? That would be perfect place for beggars.