Whenever the sum of all modifiers applied to a single combat value is greater than +3 or less than -3, the sum of all modifiers is instead +3 or -3, respectively. All modifiers continue to apply to the combat value; only their sum is changed. This rule only applies to modifiers, not to replacement values. Replacement values can alter the printed combat value by more than 3 before any modifiers apply, with modifiers still limited to a net modification of 3 on the replaced value.