Problem with Response Message

Hi

I have a schema as follows,

<Item>
 <GetDiscount_Request>
   <Item_Qty>
   <Item_Cost>
   <Price>
   <DiscountAllowed>
 </GetDiscount_Request>
 <GetDiscount_Response>
   <Item_Qty>
   <Item_Cost>
   <Price>
   <DiscountAllowed>
 </GetDiscount_Response>
</Item>

I am assigning Price value from the input received & passing  only <GetDiscount_Request> to SAP function module, my request message would be

<GetDiscount_Request>
   <Item_Qty>100</Item_Qty>
   <Item_Cost>20<Item_Cost>
   <Price>2000</Price>
   <DiscountAllowed>

Not sure I am getting the response message as
<GetDiscount_Response>
   <Item_Qty>100</Item_Qty>
   <Item_Cost>20<Item_Cost>
   </DiscountAllowed>

I have newly added the <Price> element in both req and resp messages. I am able to send the request with newly added element satisfying certain conditions in a map, not sure why I am not able to see the same value in output, at the same time I am not getting <DiscountAllowed> in the output.

Note- The SAP function module is returning 4 values.

Please advice……