I have registered my buyer agreement for sales of my apartment and one covered car parking with stamp duty of 2% of consideration value with the sub-registrar. Latter on I have decided to purchase an additional car parking. Now developer saying that the additional car parking space will be incorporated in the Deed of conveyance taking into account the new consideration value (i.e. addition for the cost of extra parking space). However, developer saying that the revised buyers agreement for sales will not be registered with sub-register as Deed of Conveyance when registered will supersede the Buyers Agreement for Sale. Please suggest whether this is okay or not regarding the paper work. Thank you.