Last Name and Full Name fields issue in ESS for IT0021

Hi Experts,

I am facing a weird issue here in standard Component Configuration for Family Dependents i.e. IT0021.

As per PA20 when creating any subtype in IT0021, the Full Name field appear to FCNAM. When i check the overview screen the Last Name and First Name appears, where Last Name is FANAM and after record is created, FCNAM is copied to FANAM.

Debugging the Include screen also shows that FCNAM is Copied to FANAM.

But in ESS, the Copy is not happening. Also cannot debug the class CL_HRESS_PER_DETAIL_GENDER.

Please let me know how can i debug or rectify this issue.

Thanks.