carrying over property loss on self assessment form

Jo_anne_2

I have searched for an answer to this but not found one yet, so would be very grateful if anyone can answer my quick query. Here goes:

I have almost finished my self assessment tax return, but am puzzled about the 'calculating your taxable profit or loss' section in the Property section.

I have entered my buy-to-let loss carried forward from 2006/07 in box 37, and my loss for 2007/08 is in box 39. Now, box 41 which says, 'to carry forward to following year, including unused losses brought forward' seems have to been calculated automatically but this shows only the loss for 2006/07 - not the sum of the two years losses. Why has it done this, and how can I amend it?

Many thanks