What does the India–US stock limb require beyond maintaining stock and delivering?

Article 5(4)(b) opens with a precondition — the person has NO authority to conclude contracts ("he has no such authority, but…") — and then requires habitual maintenance of a stock, regular delivery from it, AND that additional activities conducted in India on the enterprise's behalf contributed to the sales. The sales-contribution conjunct is an India–US addition absent from the OECD pattern; stock plus delivery alone does not complete the limb. (Domestic Explanation 2(b) to s.9(1)(i) carries no such conjunct — the treaty is narrower and prevails for a treaty-entitled enterprise via s.90(2).)