Difference between registered agreement and unregistered agreement

Good evening sir/ madam,

my uncle has entered into sale agreement with other party, which is a registered agreement, but the schedule property is in the court for partition.. how will be it decided? and there is also a will where my uncle name is not mentioned in the will. will is prepared by my grandmother when she was alive, she was also party in the partition suit. partition suit is between my grand father younger brother and my family.