New Delhi, The CBI has filed a charge sheet against the then CMD of Air India, German firm SAP AG and IBM in connection with alleged irregularities in procurement of software worth Rs 225 crore by the national carrier in 2011, officials said on Sunday. The CBI has registered the case on the recommendation of the Central Vigilance Commission (CVC) which found prima facie procedural irregularities in the procurement of the software, according to people in the investigation agency in know of the development.