Can't change the order number of an existing asset (workstation)

Can't change the order number of an existing asset (workstation)

Hello,
When we receive new hardware we always enter the service tag of the hardware (often laptops) and the system will automaticaly create the asset with the po number and the service tag.
Unfortunately someone made a mistake and confounded two orders. So the laptop from order 1 was received in order 2 and the laptop from order 2 was received in order 1. 
So now we have the problem that we have two assets with the incorrect order number. The problem is that we can't change order numbers from existing assets. (atleast not from the edit button)
Is there anyway to solve this problem?

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