You are looking for a Data Source where you can find amount entered in expenses marked as Personal Expense.
Currently there is no data source available which provide amount entered in expenses marked Personal Expense.
Data Source will be available in one of the future release of SAP Cloud for Travel & Expense Solution.
KBA , SRD-FIN-AU , Auditor Workcenter , How To
SAP Cloud for Customer core applications 1305 (old) ; SAP Cloud for Travel and Expense 1311