Details of purchases to be filled in sheet 4a & 4b in gstr-4 compulsorily?

Not required to mentioned purchase frpm reg dealer

Purchase with Reverse charge and unregistered purchase are compulsory required to be shown in gstr 4.
B2B purchase is not compulsory and no need to be shown in gstr4.  

Note:If you show B2B purchase then also the value is not captured in gst portal after preview and submitting GSTR4.. So no need to waste time in filling this columns.

Thank you friends Vinod Sir & Ravi Sir. One more query i have, While uploading the downloaded JSON file in gstr 4 excel sheet, i thought that the list of purchases mentioned in gstr 4A will be filled automatically in excel. But it is not so. Just a query.

So as far as purchases from registered dealers, details available in the gstr 4a is enough and no need to file on sheet 4A & 4B?

Yes you are right...............

Thank you sir. So can i proceed ahead with "no details" entered in 4A&B sheet while submitting it?