No reassessment after 4 years to deny depreciation if all facts relating to such claim were disclose

IT: Where Assessing Officer after expiry of four years from end of relevant assessment year initiated reassessment proceedings against assessee on ground that depreciation was not admissible as claimed, when even as per Assessing Officer all relevant facts were disclosed and produced at time of earlier assessment pertaining to claim of depreciation, reassessment proceedings were barred by first proviso to section 147