Registered document correction need

No.  You can obtain a registered rectification deed from the seller/sellers.

You get a rectification deed executed by the vendor duly registered.

What is the document referred in the facts ?

Is it necessary  / compulsory /mandatory to get the error corrected, if so, what is the purpose/ benefit of getting it rectified at this stage since the document is stated to have been registered about 16 years ago ?

Why the error has surfaced now ? 

This is a clerical error in descripttion of property (T.S. No.), not a new transfer.

✔ Best method:

Execute a Rectification Deed (Correction Deed) between original parties (or their legal heirs).

✔ Stamp duty:

Generally nominal (₹100 or as per state rules)

Not full stamp duty like a fresh sale deed

✔ Registration:

Must be registered in Sub-Registrar office

✔ Documents needed:

Original deed copy

Proof of correct T.S. No. (record/municipal/revenue papers)

✔ If other party not available:

File declaratory suit for correction in civil court