There is no problem if you are entering and signing amanai in this regard after getting 10% of the advance you have to make m a u in such a way that all the payments should be realise bill before the date of registration and please remember to register this m o u who were the register after payment of registration stamp the builder will have the opportunity to adjust stamp duty at the time of registration of the property so the cost of stamp duty paid now will be adjusted in the registration of property