I the message could be more informative. It just tells you to review the figure without saying why, or that its just advisory.
The summary page indicates a red warning for that section, this could be toned down too - or better yet removed if you have reviewed and accepted the figure.
In my 21/22 return I recorded a loss to carry forward but when I try to complete my 22/23 return if I enter anything in the loss brought forward box, even £1 it generates a warning (IMPORTANT: Please check the help on the 'Loss brought forward' field and review the figure entered in this box). Am I doing something wrong or is this a bug?