Minecraft Username:
Pizzafrog

Brief Description:
I was trying to put a potion of swiftness into a trade sign but couldn't.

Instructions:
1.Get potion of swiftness
2.make trade sign with any price and the id of 373 (I looked it up)
3.Watch it not work

How many times did you recreate this bug?: About 13 times didn't work at all.

Result:
The [Trade] on the sign went red and i get the message "Error: You do not have 1x Potion" (which I did)

Expected Result:
What i expected was that it would take the potion from my inventory, and the [Trade] would go blue

Evidence:
Well i didnt take any screen shots or anything like that but i had HDvorteX come look and he said "Make a bug report"