XYZ is having head office in Mumbai and warehouse at Bhiwandi. Head office registered as principal place of business and Bhiwandi as additional place of business. XYZ having sales office at Kerala which is not registered with GST since no outward supply from Kerala. Kerala office received a legal service from an advocate firm but bill for the same in the name of XYZ, Head office. Is Kerala office required to register with GST for paying GST under reverse charge on legal services or head office can pay since the bill is in the name of head office?