Article 304 of Indian Constitution: Restrictions on trade, commerce and intercourse among States.
Article 304 – Constitution Of India
Notwithstanding anything in article 301 or article 303, the Legislature of a State may by law—
(a) impose on goods imported from other States 1 [or the Union territories] any tax to which similar goods manufactured or produced in that State are subject, so, however, as not to discriminate between goods so imported and goods so manufactured or produced; and
(b) impose such reasonable restrictions on the freedom of trade, commerce or intercourse with or within that State as may be required in the public interest: Provided that no Bill or amendment for the purposes of clause (b) shall be introduced or moved in the Legislature of a State without the previous sanction of the President
Constitution Of India Part 13 Trade, Commerce And Intercourse Within The Territory Of India – Articles 301 to 307
Article 301 of Indian Constitution – Freedom of trade, commerce and intercourse
Article 302 of Indian Constitution
Article 303 of Indian Constitution
Article 304 of Indian Constitution
Article 305 of Indian Constitution
Article 306 of Indian Constitution
Article 307 of Indian Constitution