In registration, the screens are divided up into two parts. The top part is the list of bowlers on this entry form. A person entered into the first position in this part will be considered position 1 on the entry form. They may coincidentally have an ID# of 1, but the important thing is that this person is considered position 1. The second person on the entry form would be considered position 2, etc.
The lower portion of the registration form is where each person on that entry form is assigned to that event and squad. To assign a person in that registration form, indicate the position, not the ID#, of the person to assign. Since there are only 8 positions on the registration form, this is why a number greater than 8 can not be entered.