This is an error generated in Walmart's system (this could be Walmart USA, Walmart Canada, or Sam's Club) regarding an issue with invoice totals you have sent to them recently in an Invoice EDI document. This invoice has been rejected.
In order for Walmart to be able to accept an invoice, the invoice total must be calculated from the total of each of your items' prices multiplied by the quantity shipped of each. If there are any allowances or charges (shipping charge, promotional allowance) you can indicate them on the Summary tab. These amounts will also apply to your invoice total. Normally, WebForms calculates the invoice total automatically, so in most cases you shouldn't have to change the number that automatically appears there. If WebForms is calculating this total incorrectly, please let us know immediately so we can fix the problem. When you are ready to re-send, you would follow the same procedure in WebForms as when you sent this document.