This condition allows the automation rule's trigger to be filtered by book percentage on either the back side or the lay side of the market.
It could be used to back the whole field if the book percentage drops below 100%; in the screenshot below the condition will allow the rule to trigger if the book % is less than 99.5%
The condition can also be used to prevent betting into markets with inefficient books (indicating an illiquid markets that is likely to be volatile and difficult to trade).
