Customer Lock Box Setup field descriptions

Customer #: Specify a valid customer number. The customer number must exist in Customer Setup and must be active. The lock box number, in combination with the customer number, creates a unique key for this record. This number is matched to the lock box number by the Customer Entry Lockbox Import Report when payment transactions are posted.
Lockbox #: Specify the lock box number. This is a unique identifier assigned by the bank to their lock box and is transmitted with the payment information. It is matched to the customer number by the Customer Entry Lockbox Import Report when payment transactions are applied.