Dear Ajay,
In my understanding reporting point backflush is generally used for the products with a long lead time
and setting the reporting points in the task list level for more than one operation(more than confirmation
point). But in your case you have set only the last operation as reporting point,but instead of this without
any reporting point directly you can go for assembly backflush.
In which report are you checking the results?
Regards
Mangalraj.S