Item not available in the Price List

Recently one of our Technical guy reported that , they have setup a complete New operating Unit , Inventory Org ( Master / Transaction) , New items etc. Everything work fines , but Item is not visible in the Pricelist. For the sake of testing he set ALL_ITEMS in the Price list and able to Book/Ship/close order line with a default price.

Initially I don't see any issue with the Item or any other Setup , but WHY on earth Item still not visible to Price list.But latter I found that it is because of a Silly mistake.We have one Profile option
QP:Item Validation Organization and It should have a value of your Master Validation Inventory Org  , but in this particular case he left it blank and because of it Items were not Visible in the Price List.