Section 9(4) is on inward supply from URD , & As of Today the same has been applicable only on Promoter /Developer. (Refer Notification 7/2019 ,CT (r)
Section 9(3) is on inward supply of Goods & Services , for the same the Notification 13/2017 CT (r) is issued prescribing RCM on services & Notification 4/2017 CT. (R ) on Goods