Look at rule 24.3.1
The 2nd referee's check of the line-up is a courtesy. The responsibility to ensure the correct players are on the court resides with the captain and/or coach.
At the start of each set, at the change of courts in the deciding set and whenever necessary, the 2nd referee checks the actual positions of the players on the court correspond to those on the line-up sheets.
This is in the DCR on page 72.
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