A la Carte can require a minimum dollar amount ("A la Cart: Amount ($) Minimum Value (excluding tax)") and/or a minimum item count ("A la Carte: Item Minimum per Checkout") before you can add to cart. While you're still short, the A la Carte ordering page shows a live warning bar: "We have a «total» item order minimum for A la Carte. You've selected «current»/«total». Please select «left» more meals to checkout" (item minimum) or "We have a «total» order minimum for A la Carte. You have «current» in the cart currently. Please add an additional «left»..." (value minimum) until you clear the bar.