Hello Ramesh,
1st ask him about his interest. It’s not like 'he completed MBA Fin & HR so he has to select only Finance/HR'. Based on his personal interest he can choose any module like HR/FICO/ABAP......etc.
Coming to the Employer point of view, they will check your knowledge on SAP module and they need Master degree that’s it. They are not bothered about your stream and all............ 
So, 1st let him decide buddy....... All the best…. 
Regards,
Srinivas