NEW YORK (Standard&Poor's CreditWire) Nov. 2, 1999-- Standard&Poor's assigned its triple-'B'-minus rating to Transportadora de Gas del Sur S.A..'s (TGS) US$75 million Inter-American Development Bank (IADB) B loan due 2011. The rating is based on the triple-'B'-minus issuer credit rating of TGS. This is commensurate with the company's ability to meet its financial commitments and to continue functioning in its role as a provider of natural gas. Due to the regulated nature of TGS' business, TGS' rating is constrained by the triple-'B'-minus local currency sovereign rating of the Republic of Argentina. The rating is also based on the extension of the IADB's de facto preferred creditor status with the government of Argentina to mitigate any transfer