I also find it hard to understand the business process.
Did you mean that the client wises to distribute certain products to customers on some kind of quotas?
Or it is related to the risk of customer not paying, or to maximum value restrictions on cash transactions or it is something completely different?
What should be blocked after you set this flag?
Assume you flag the order, then what should happen - you will send it for approval, or you have to make some changes to the document, or you will not process it further?
Please provide a detailed step-by-step explanation of the complete business process - AS-IS and outline the desired outcome - TO-BE, so that you can get high quality replies.