There is a field in the background that can be used within the Access Evo Analytics tools, but it is not possible to extract this via the Expenses app itself.
There are no plans to make the field visible in expenses, but it can be used in Access Evo Data Engine and Analytics reporting.
If you require more information on the above then please contact your Account Manager to discuss further, in the meantime support can extract this information via some SQL scripts so if you would like to request this then please contact support