The inverter must be limited by factory settings at 16A (ie you have not changed the settings yourself to limit the inverter to 16A). Also the DNO must recognise these settings from the manufacturer by the inverter being type verified. If these two have been done, it should be accepted on G83/1. If not, your install is G83/2. I am pretty sure SMA will have complied with this, so it should be G83/1.
A few inverter manufacturers have responded to this "16A" issue now. We stock SolarMax 4200S inverters which are factory limited to 16A.