Predictive text within the Product Sales, Customer Order would list all existing numbers or letters already in system when a new Customer number is input and as more numbers are added list would decrease until unique order number is entered.
If duplicated then confirmation would be required to proceed and Save Product Sales Order.
Example: If Customer Order number is inputted and their numbers starts with 45223...…. then all existing Order numbers in the system starting with those numbers would show in some drop down box until the new inputted number is unique.
This would prevent Order duplication