Typed this while holding a stack of Tiningot:
/ymladditem tiningot 28 12000 56
/loaditems default
/additem all ServerShop

Tried then:
/hs max
/hs 1
/hs 2

It recognized that I am holding tiningot, but when I try to sell it, it just say you have to sell at least 1.

This in YML and is imported to MySQL DB (Checked and verified):

tiningot:
information:
type: item
category: unknown
material: X5267
id: 5267
data: 4
value: 28.0
price:
static: false
staticprice: 56.0
stock:
stock: 0
median: 12000
initiation:
initiation: true
startprice: 56.0

Tried to set stock to 1 and then buy it. That works just fine and get the right item. Tried then to sell it again. Still wont work.