PLACIDO O. URBANES, JR., vs. COURT OF APPEALS, SOCIAL SECURITY SYSTEM, HECTOR B. INDUCTIVO, in his capacity as Chairman of the Purchase and Bidding Committee, GODOFREDO S. SISON, ISABELO I. LISCANO, AURORA E.L. ORTEGA, SUSANA K. INCIONG, EDGAR B. SOLILAPSI AND CECILIA C. CANLAS, as Members