Amendment & Miscellaneous
For 5 years from the Constitution's commencement, Parliament had power to legislate on certain State List subjects (like intra-state trade in textiles, foodstuffs, coal, iron, and steel) as if they were Concurrent List matters - any such law lapsed (for the incompetency) at the period's end, without undoing things already done.
This was a temporary, time-limited provision (long since expired, 1950-1955) that let Parliament legislate on certain essential-commodity-related State List subjects during the Constitution's early years, reflecting the post-independence, post-Partition economic disruption that made centralised coordination of these specific goods particularly important during that transitional period.
This provision is now purely of historical interest, having applied only to the Constitution's first five years, addressing a specific early-independence economic coordination need for essential commodities like foodgrains and textiles.