''5.5. In this regard, it is the contention of the learned counsel of the assessee that Form 3 CM does not prescribe as from what date the deduction has to be given. Further, the learned counsel of the assessee produced before us letter from the prescribed authority dated 18.5.2007 whereby it has been mentioned that the assessee's in-house R&D Unit's application for renewal of recognition beyond 31.3.2006 has been considered and it was decided to accord renewal of recognition to the unit up to 31.3.2009. Again, vide letter from the prescribed authority dated 26.6.2003, it has been mentioned that the assessee's inhouse R&D Unit's application for renewal of recognition beyond 31.3.2003 had been considered and it was decided to accord renewal of recognition to the Unit up to 31.3.2006. The learned counsel of the assessee further produced letter dated 10.7.2000 whereby, by reference to similar application for recognition beyond 31.3.2000, the concerned authority had decided to accord renewal up to 31.3.2003. Again, vide letter dated 24.4.1997, with reference to application for renewal of recognition beyond 31.3.1997, the renewal was accorded for a period up to 31.3.2000. The learned counsel of the assessee further submitted that assessee had duly submitted application