1. sec 9(3) : RCM applicable based on the said sec also notified it's Goods and Services. You can find out the details of transactions...
***sec 9(4) : It's applicable to registered dealer who is purchased from unregistered dealer then RD will be pay Tax under RCM basis as per goods or Services rate of Tax. (Except sec 9(3) related activities)
section 9(3) services are notifed by the notification 13/2017 CT (r), ie GTA ,Advocates,Director of co., Insurance agent , photographer, music composer Services etc Notification 43/2017 CT (r) purchase Raw cotton Agriculturist also fall under 9(3)