Markup Table

So I have a cost plus contract that I billed a few line items out on last month and everything pulled through. (For further background there are some line items with a markup table and some that are just straight cost) It didn't seem to be a problem last month, however, this month I added a few new line items to the contract, and everything would pull through to the WIP but one. The error was "No Markup Table for Rate Calculation" however, there are other line items that didn't have a markup table and they pulled through just fine? Doesn't make sense to me?