The security deposits held report is used to report on security deposits recorded and paid by customers that are currently being held on invoices that haven't been closed/finalised.
The Owing column will display amounts where a security deposit has been entered against an invoice, but has not been banked yet.
The Paid column displays deposits that have been banked, but the invoice is yet to be finalised.
The Balance column is calculated based on the Paid column minus the Owing column.