The Routing Rule Tester screen explains why an order was routed to a particular printer.
For each rule set up in the Routing Rule Designer (Setting Up Routing Rules), the expected value of a condition will be displayed (e.g. Sphere >= +2.00), and the actual value for the order will be shown underneath (e.g. +1.50/+1.75).
If the condition is considered matched then it will be colored in green. The overall matched rule (the first one with all conditions matched) will be colored in green.
This screen can be accessed with the Test button in the Routing Rule Designer, or with the Explain Route button in the routing section of the Order Entry screen.
Note that if you launch the tester from Order Entry, you will not be able to change the selected order.