In company settings there's a credit limit and a build limit - here's what they mean.
NOTE: If you are not requiring your customers to pay before processing, then you are REQUIRED to set a credit & order limit.
The credit limit is how much credit you will extend to that customer, or in other words, how much product you'll give them without having first received payment.
Order limit (or build limit) is the amount of product that you will build but NOT necessarily ship to a company. The company might need to pay their balance before the product will be shipped to them.
Remember this isn't just referring to the limit of one order. The total amount of their unpaid orders will contribute to this number.