When do you assess the T?

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Here's the situation, Team A's coach doesn't know all the numbers of his team members. He fills out the scoresheet, and leaves the sport for 2 number blank. The coach tells you he's expecting both players to show up and play, and asks you how many t's he's gonna get for changing the scoresheetfor 2 players. Now both players show up. Is the technical foul assessed when the team members without numbers in the scorebook become players, or is the foul assessed when the team member's numbers are added to the scorebook?