Before clicking "Purchase Order" button in "Store Orders" to quick place your orders, you have to handle connect Store SKU to the Item Number. 

Step 1 Confirm your store SKU connect to which product Item Number on DOBA >> copy your store SKU and Item Number

Step 2 Log in your DOBA account > click “Connection” in the left sidebar > click “ Add Sourcing Connection”

Step 3 Fill in all blank columns with red sign > paste your store SKU and Item Number > click “Check”

Step 4 Click “Add Now” > a pop-up showing you connected successfully > click “ Confirm” or “Continue to Add” as you wishStep 5 Click “Confirm” > see the connection you have added just now