The screenshot below is the Allergens page for the recipe Basic Butter Cream. You'll notice it indicates that the ingredients used in the recipe contain Milk and Eggs (2 major allergens).
When setting up your ingredients or recipes - you may find yourself looking at the Allergens page for a given recipe where you see a warning that several of your ingredients do not contain an allergen declaration. This is because we never assume that an ingredient has no allergens until you specifically say so.
To fix this, you'll want to go and edit the ingredients and either set the allergens that are contained in the ingredient, or specifically state that this ingredient has no major allergens.
If you say "No", we assume this ingredient has no major allergens. If you say "Yes" we will show you a list of the major allergens and let you select which major allergens are contained within this ingredient: