Hi Vijaya,
I think you are trying to read data from ALV table instead of normal table.
If you are using alv table, the changed data will not be updated in context node immediately after action. To get the latest changed data of alv into context node, you need to use the method REFRESH of interface controller of alv component.
lo_interface_alv_ctrl->refresh( ).
Now, the latest data from alv will be updated into the context node.
Hope this helps you.
Regards,
Rama