Stay Geng-Geng
Step 1: Go to "Order Enquiry" on OPRA Landing Page
Step 2: Ask probing questions to make sure you are going to see the correct item, then click "Order Items" Tab
Step 3: Confirm it with the customer, then copy or remember the first 7 characters under the colum "Item" for example here, "BNT1788"
Step 4: Put the reference number on "Ref:" field on order entry screen and proceed as usual