Customer Clearing

Dear SAP FI Consultants,

SD Generates Customer Invoices resulting in Dr. Balance in Customer Ledger as Open Item. FI Records payments of customer ( not through F-28), therefore a Cr. Balance in Customer Ledger as an Open Item. Another user clears them through F-32.

There are around 50,000 Customers having daily transactions as above.

Is there any other way to clear customers.

Best Regards....