To help facilitate the billing reconciliation process, the 'Payment Mismatch' filter can be very useful. This filter can be found on the Reconciliation screen:
With this filter set, only the billing records that are LOCKED and whose billing amounts do not match the Amount Paid will be included in the reconciliation table. Most likely these billing records will need re-billed.
There is also a report that can be used for the same purpose. Report 47 includes a 'Payment Mismatch' filter and 'Billed Amount' vs. 'Paid Amount' columns:
Note: for billing records that were imported and not created in Brittco, they will be identified in the Warning column as "Imported".