GSTR 4 Purchase bill details

Purchase  details  in  Table 4A  of  GSTR 4  , will  be auto populated  form  GSTR1 , filed   by the supplier  , I think  same  you have to  Verify  form your Books of Accounts  , just  confirm  and reply  . 

If they are not auto opupated in Table 4A   of GSTR 4   means  ,  supplier may not  have filed  GSTR1  , just  you have  confirm from supplier  , because  if you purchase from registered   supplier  he will  file  GSTR 1 .