You can use the same number series for prepayment  invoices and regular invoices, or you can use different number series.  If you use different series, they must not overlap - there must not be  any numbers that exist in both series.
Za avansne in navadne račune lahko uporabite enake ali različne številčne serije. Če uporabite različne, se med sabo ne smejo prekrivati – ne smete uporabiti številk, ki obstajajo v obeh serijah.