[Users] acc module db_extra accounting issue

[Marcello Lupo]

Hi,
i have a db_extra accounting rule like:

modparam("acc", "db_extra", "customer_code=$avp(i:102)")

The avp value is 12 and i checked it with avp_print() .

DEBUG:avpops:print_avp: p=0x2a97a866e8, flags=0
DEBUG:                 id=<102>
DEBUG:                 val_int=<12>

When it is accounted in the table the value become 11 !!!!!
the field in the table is type int(10) .

How is it possible??
Thanks,
Bye,
MArcello