How to avoid System Transactions in Manual Reconciliation Page under Cash Management

There is a dummy bank account that we have created to clear out the invoices and transactions where client is clearing them from other sources. However, once we do the payments and receipts, these transactions are coming in Manual reconciliations page in Cash Management. As there will not be any bank statement for this there is no Reconciliation for these. However, client don't want to see these transactions in Manual reconciliation page under this bank account. How to achieve this?