If the rolls for a week are created twice, the records on the roll will be duplicated.
To correct the roll, select Office Admin > Roll-Marking Tuition > Oops! Delete Duplicated Roll and follow the prompts.
The script asks you to specify the Week Commencing date of the roll that was duplicated. It then sorts the roll records so that any that have already been marked are at the top, and then removes the duplicate (unmarked) copy of each roll record. If a roll record has been marked, it will not be deleted.