Income Tax Losses - cannot change

I have submitted my 2024 return and am in the process of preparing an amendment. There are two new figures which work fine. I also amend the figure for income tax losses. This provokes a red warning - check this figure etc. I click save and continue. However, the new figure does not feature in the calculation. So, in effect, I cannot change the first number submitted.

Hi 

If the losses are not being used there will be no change to the calculation.

Thank you