Siddharth,
Thanks for the input. I am using the same alias to employee profile used for other services which are working. I have cleared the cache, Deactivated and reactivated , deleted and re added service etc. Attaching the screen shot where ToEmployeeCards return 200 while ToEmployeeOverview returns 500 for the same service HRESS_EMP_PROFILE/EmployeeCollection.
In debug when I deleted all entry's in V_T77TMCDRCNFFLD except for personnel Info fields like email, phone it worked. cl_hrtmc_dr_configuration=>get_field_values is throwing exception.
Appreciate your help!
Chandra.