What is your query?
You say that it is an error that sale consideration is paid, how can be that an error?
If there was already a sale deed, what was the necessity for another sale cum construction deed, it could have been just a construction agreement/deed?
Well in that also the same thing i.e., it was Rs. 10 lakhs was paid, what is the error in it?
In any case, what is that you want to say?
Do you want to cancel the sale deed or the sale cum construction deed?
If both parties agree to the proposed cancellation, you may jointly execute a cancellation deed cancelling the document desired o be cancelled.
Please be aware that a sale deed cannot be executed without a mention about the payment of sale consideration amount in it.
Therefore ordinarily a registered sale deed cannot be cancelled just like that at your whims