help with formula
 

I have this formula
=IF(PRICEOVERRIDE!B20,PRICEOVERRIDE!B2,IF(ISNA(VL OOKUP(E19,TABLE1A,3,FALSE)),"",VLOOKUP(E19,TABLE1A ,3,FALSE)))
it is located in the price column of my invoice....when I use the price
override it displays that price in all 27 price cells on my invoice how can i
make it dislpay only in the line I am using the invoice is set up like this
from left to right.......
QTY ITEM# DESCRIPTION PRICE SHIPPING EXTENSION



DESCRIPTION, PRICE AND EXTENSION ALL HAVE FORMULAS IN THEM