Add Time Approver field on Timesheet Screen

Hi,

We have a custom field created on employee screen called ‘Time Approver’. I am trying to show that on the timesheet screen that the users access to fill their time using Employee Centre license. I create a custom field on the screen and tried to source it with the Time Approver field from employee but it is not pulling the value through and field stays empty on the timesheet screen despite trying several options. Not sure what I am doing wrong. Any guidance would be much appreciated.  Thanks