Hi Ankit,
SAP Note 1668882 is a general SAP Note for correct functionality of SAP transaction SNOTE (Note Assistant) and usually there's no need to implement this (and/or +15 of the other) note.
It's clear that you are facing an upgrade issue.
Please get an ABAP'er or BW consultant with ABAP experience involved in analyzing/solving this issue. Most likely there's an SAP Note that solves your error. Don't try to reinvent the wheel.
Rgds,
René