Selling from inventory

I went to Settings, Purchase Invoice Items; there, I created two new Purchase Invoice Items and i put them under Sales account.

Now, one of my clients wants to buy the items; as a result, I tried to create a new Sales Invoice, but I cannot see the items in the Item drop down.

Manager has no inventory module yet. Sales Invoice Items and Purchase Invoice Items are really just memorized invoice item lines. Until inventory is implemented, you need to create item in both lists if you are buying it and selling it.