Favorites not coming in My Timesheet Fiori App

Hello Folks,

We've implemented My Timesheet Fiori App (Version 2) in our environment.

But we are not able to get the Favorites option while working with the app.

When I debugged the app, it is checking for the implementation of BAdI 'HCM_B_TSH_FAVORITES' and since it was not implemented,

favorites is not coming. When I try to implement the BAdI, it is throwing message that 'BAdI is internal SAP; implementation in customer namespace is not allowed' and not letting me to implement. Can any one suggest are we missing any config here?

Br,

Raja.