Account code in AMPUSER

i install a freepbx + a2billing all works after a lot of time…
i just found an error :
there is no accountcode in the asterisk database
"database show AMPUSER"

but the follow me function ask this
exten => 9876,n,Set(CDR(accountcode)=${DB(AMPUSER/9876/accountcode)})

so i must do " database put AMPUSER 9876/accountcode 123456789" for each extention

where can i modify the php pages for insert/change this when i do it on the web interface

thanks for your responses and sorry for my English

up please