Price overides with IDOC PORDCR101

Hi there, using the idoc PORDCR101, Iu2019m creating a PO in R/3. Everything works fine but I need to do a price override. If I map a value to NET_PRICE, it still uses the default SAP value for the price. Is there some IDOC layout that explains where to map the values to accomplish this?

Thanks,

Jan