Using Sequence Gen in Trigger

Can a Sequence be used in a insert before row Trigger?

create or replace trigger package_id_trigger

        before insert on tracking
        for each row 

begin
           
        :new.R_45_145_Package_ID := package_seq.nextval;
       

end;

When I compile this trigger I get a error stating that a Sequence can't be used in this context. It seems you can only use " package_seq.nextval" in an insert statement?

Any input.........

                      Thanks Rick Ryan....  
                      rickryan_at_global2000.net