Trading query regarding amtekauto

[Bhuvan]

@punitlunia27

I was holding amtek auto share and i sold today and want to purchase again same day its got rejected “blocked for BZ nsc_cm” “block for intraday trade”

Explained here

What is BZ Category and why is Gammon India trading in that category?

I just noticed that Gammon India Limited (GAMMONIND) is trading in BZ group on NSE. Can someone explain about this group and why are stocks moved to it?