R1213 OM: Configuration item Creates two AR Invoices

Hi Team,

we have an issue with Configuration Order which has a Model Line and Multiple Options lines(Some has Amount and Some has Zero amount) we processed thru AR but system generates two AR Invoices one for Model and another for Options lines, it should have been generated only a AR Invoice instead of Two AR Invoices. could you please any one put your thoughts and inputs to understand the system functionality around ?

Thanks,

Sekhar