It will be average purchase rates calculated per item based on all purchase orders. lets say if you have different prices for same item, it will calculate average purchase rate.if you are using this option, system will calculate rates average taken from goods received note.It will be calculated for Purchase i.e. GRN in same/current store only.
This is price is calculated between inter- stores. It means, let say two stores can create their own PO and they have different prices for same item. When one store issues some item to other, it will take an average of both store’s item price, when report is fetched using this option. This average price will be average price of 1. items received from other stores & 2. GRN of current store.