There is an extra point on the X2 ''Amending an Order'' training pages.
Please review these pages, specifically points 5 -1 and 5 -2.
Basically, when amending an order, if some of the products on the first order are still needed on the second order, you need to fill out the order amendment form as ''re-allocation''.
This will then give you the option to confirm the old order number and then the new order number.
Our order processing team will then make sure anything from the first order that was allocated is allocated to the second order instead where the products are the same.
Any questions, please just let us know.