Price and Pricing conditions are not copied to PO for a line item !!

Hi

I have created a PO w.r.t a PR which has only one line item.

Now, I add another line item to this existing PO, i get an error message that the Price and Pricing conditions are not copied.

How do i rectify this error !!

Where might be the link for this Price and Pricing conditions to get copied in to this PO ??

MaruthiRam