How to override how AutoLockbox Identifies Customers for a Receipt - Use Invoice Number matching bef

How can we override how AutoLockbox Identifies Customers for a Receipt. By default AutoLockbox first uses the Customer Number to identify the Customer. If no match is found and the Customer Number is populated it uses the MICR Number to identify the Customer. If neither of the above finds a match and the AutoAssociate is checked on the Lockbox various Auto Associate rules are used to find the Customer. We would like to use the Invoice Number to be used before any of the other matching methods are used. How can this be achieved?