Section 4
[(2) The advance ruling referred to in sub-section (1) shall remain valid for three years or till there is a change in law or facts on the basis of which the advance ruling has been pronounced, whichever is earlier:
[(2) The advance ruling referred to in sub-section (1) shall remain valid for three years or till there is a change in law or facts on the basis of which the advance ruling has been pronounced, whichever is earlier: