GSTR 4

No need ..As per notification no 26/2018 central tax dated 13/6/18
in FORM GSTR-4, in the Instructions, for SI. No. 10, the following shall be substituted, namely:-“10. For the tax periods July, 2017 to September, 2017, October, 2017 to December, 2017, January, 2018 to March,2018 and April, 2018 to June, 2018, serial 4A of Table 4 shall not be furnished.”;Earlier this was waived till December, 2017Serial 4A of Table 4 requires the Composition dealer to furnish details of inward supplies received from a registered supplier (other than supplies attracting reverse charge)

Yes agreed with Pankaj sir.

purchase with Reverse charge and unregistered purchase are compulsory required to be shown in gstr 4.
B2B purchase is not compulsory to be shown in gstr4.