Set aside by ITAT

In a case CIT (a) dismissed the appeal of assesse and later on ITAT set aside the order and revert back to ao for give an opportunity of being heard before passing fresh order. However the AO did not pass any order till now and demand of original base order is still on portal. The time limit mention in sec 153 the for set aside order have been lapsed . So what will be status of original base order 143(3) and demand raised.