Price Lists: Last Purchase Price 
The prices in the Last Purchase Price price list are updated automatically by SAP Business One when you perform any of the following transactions:
Entering a purchasing invoice
Entering a goods receipt purchase order
Entering a positive opening balance for an item
Entering a positive inventory result that triggers a goods receipt purchase order
Entering a landed costs document
Manufacturing a product with a bill of materials that calculates the price of the product according to the components' last purchase prices
If SAP Business One has not performed any of the above transactions for an item, it is not included in the Last Purchase Price price list.
Note
When you issue one of the documents mentioned above using a date prior to the last update date of a certain item, the last purchase price is not updated.
Note
If you enter one of the above transactions with a value of zero, the price is not included or updated in the Last Purchase Price price list.
Note
You can refer other price lists to the Last Purchase Price price list using a defined factor.
Note
You cannot change the prices in the Last Purchase Price price list manually. That is, as long as an item has not been entered into the warehouse in one of the ways mentioned above, it will not have a last purchase price. The last purchase price can be used as a base price for other price lists.