Hi Nikhil,
Create an attribute gref_owner in the context node class which have ref type to implementation class. Now redefine the method IF_BSP_MODEL~INIT of context node.
Implement below
super->if_bsp_model~init( id = id
owner = owner
).
gref_owner ?=owner.
Now in get_xxx method access the implementation class attribute as gref_owner->gv_xyz.
Regards,
Nikhil