2106.90.03.00 - Described in general note 15 of the tariff schedule and entered pursuant to its provisions

This HTS subheading covers specific food preparations derived from dried milk, dried buttermilk, or dried whey. The key defining characteristics for classification under 2106.90.03.00 are: the dairy component must originate from specified subheadings (0402.10, 0402.21.05, etc., and 0403.90.41, 0403.90.45, 0404.10.50, or 0404.10.90); the mixture must contain not more than 5.5 percent by weight of butterfat; and the mixture must include other ingredients, such as sugar, resulting in over 16 percent milk solids by weight. Crucially, these preparations must be capable of further processing or mixing with similar ingredients and not be packaged for direct retail sale in their imported form.

This classification is distinct from its sibling categories. HTS code 2106.90.06.00, for instance, applies to goods described in additional U.S. note 10 to chapter 4, implying a different set of criteria and potentially different end uses or composition. The "Other" sibling (2106.90.09.00) is a residual category for preparations that do not meet the specific requirements of 2106.90.03.00 or 2106.90.06.00. As this is a leaf node, there are no further subcategories; therefore, the focus remains on precisely meeting the criteria outlined in the description for definitive classification.