Hi Jitendra,
Yes, you can trigger Supply Function explicitly by using method INVALIDATE( ) of interface if_wd_context_node as below
METHOD REFRESH.
data lo_node type ref to if_wd_context_node.
lo_node = wd_context->get_child_node( name = 'MY_NODE' ).
lo_node->invalidate( )
ENDMETHOD.
Hope this helps you.
Regards,
Rama