OrderMapping doesn't work.

Hi

I'm getting the following error when executing OrderMapping

One or more errors found during validation:
Warning O0014 - Class property CactusLineItem.OrderLevelDiscountsApplied 
listed
in the storage mapping is not mapped to a column
Warning O0014 - Class property CactusLineItem.ItemLevelDiscountsApplied 
listed i
n the storage mapping is not mapped to a column
Error G0043 - Parent property LineItem.OrderLevelDiscountsApplied in 
collection
relation****p LineItemDiscountsApplied does not exist in the storage
mapping
Error G0043 - Parent property LineItem.ItemLevelDiscountsApplied in 
collection r
elation****p ItemLevelDiscountsApplied does not exist in the storage
mapping
Error G0074 -
          Class DiscountApplicationRecord has no collection 
relation****ps associa
ted with it, implying it is a root class,
          but 1 other root cl***** have already been found, including 
class Purch
aseOrder.


Can you help. What I find confusing is that I only replaced the 
instances of LineItem to be my custom LineItem class.

Thanks for any pointers in resolving this

Phil.