I have a number of parts whose purchase price changes frequently.  If I make a PO for qty 1 and adjust the price on the PO, then go back and change the quantity, the price reverts back to what is on the product page purchase tab.  I do not want to have to change that field every time I need to buy these parts.  Is there a setting somewhere that will make it not revert back to the price on the product page?  TIA.