If your structure has a gutter height lower than 2m, you will see a warning symbol on the gutter edge of your structure

When you run an Engineering check you will receive this warning

You will also receive a warning when you Open your System BOM

This is a warning only to prompt you to double check your elevations and ensure the design is in line with what you and your customer want. You can chooses to Ignore the warning or amend the design.