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The HSN is a multipurpose international product terminology acknowledged by the World Customs Organization. The purpose of using the HSN codes is to ensure that GST billing practices are in accord with international standards of product nomenclature.
Wiki Answers; Definition of; CPN Numbers and Legal CPN.. The CPN is a nine-digit number that has the exact same genetic makeup of a Social Security Number. This is not a government issued number like an EIN or TIN. This number is NOT a new social and NOT a tax ID or EIN.