forgot outward supply's details

NAGA (ACCOUNTANT) (504 Points)

18 April 2018  
dear sir,
in gstr 4, i forgot the outward supply's in jul to sep qtr. now in gstr4 offline tool i entered the data in amendment sheet.i.e.7 (TXOSA), but the error message came."no original data available to amend), i can't understand this error message, now where I can show the forgot outward supply's.
pls . help.