The Problem Health Canada maintains an Active Pharmaceutical Ingredient profile in the Single Window Addendum that maps to dozens of HS codes at the six-digit level. If you import a chemical substance that falls under one of those mapped codes but you're not bringing it in for pharmaceutical use — industrial feedstock, lab reagent, educational sample — the system still tags it as an API and triggers the full Health Canada OGD release process . You can't file the eManifest data without addressing the profile. This comes up most often with importers of fine chemicals, industrial solvents, R&D samples, and educational institutions running science curricula. The HS code is correct, the goods are not pharmaceuticals, and there's no practical way to sever the link in advance.…