APPROVING AMENDMENT TO NO. 4 OF ANNEX “D”, CONTRACT IMPLEMENTATION GUIDELINES FOR THE PROCUREMENT OF GOODS, SUPPLIES AND MATERIALS, OF THE IRR-A OF REPUBLIC ACT (RA) NO. 9184, (GOVERNMENT PROCUREMENT REFORM ACT), PROVIDING FOR THE INCLUSION OF A PROVISION FOR THE APPLICATION OF ADVANCE PAYMENT FOR PROCUREMENT OF GOODS AS SECTION 4 OF ANNEX “D” OF THE IRR-A OF R.A. NO. 9184.