[BillyMac]

NFHS 10-1:

ART. 1: Fail to supply the scorer with the name and number of each team member who may participate and designate the five starting players at least 10 minutes before the scheduled starting time.
PENALTY: (Art. 1) One foul for both requirements. Penalized when it occurs.

ART. 2: After the 10-minute time limit specified in Article 1:
a. Change a designated starter unless necessitated as in 3-2-2a.
b. Add a name to the team member list.
c. Require the scorer to change a team member’s or player’s number in the scorebook.
d. Require a player to change to the number in the scorebook.
e. Have identical numbers on team members and/or players.
PENALTY: (Art. 2) One foul only per team regardless of the number of infractions. (Art. 2a) Penalized if discovered before ball becomes live to start game. (Arts. 2b, c, d) Penalized when they occur. (Art. 2e) Penalized when discovered.

10-1-2-c states that it is a technical foul to change a number in the scorebook after the 10-minute time limit specified in Article 1. 10-1-2-b states that it is a technical foul to add a name after the 10-minute time limit specified in Article 1. So what if #20 is originally listed as John Doe, and #21 is originally listed as James Doe, but at halftime, it is discovered that these names and numbers have been mixed up? The names are already there, so names have not really been added to the scorebook. However once you erase one of the names, then, technically, another name must be added.

However, some may conclude that 10-1-1, which deals with both names and numbers, may carry over after the game has started. But 10-1-2 deals with before the scheduled starting time, which may indicate that it doesn't carry over once the game begins.

Great question ranjo. Let the debate begin.