Parameter Query Using Dates Leading To Subtotals

I have a list of coded transactions in column A, Amounts in B and Dates in C.

I want to show subtotal for all amounts with the same codes in D

I can do this simply without the date parameters, but I need to give timeframes.

When I add the [From] and [Until] questions it then shows the amounts next to each date even though the date column is hidden.

I'm aiming for the subtotal of amounts for same codes between given dates:

Example
ABB 100 1/6/11
ABB 100 6/6/11
ABB 150 1/8/11
ABC 50 1/7/11
ABR 50 2/8/11
ABJ 50 1/5/11

If I enter 1/6/11 and 30/6/11 I would expect ABB to show 200 total as 150 is after that date and so not counted.