Your EC-integrated template has an Effective Date of April 1 under Worksheet Settings. Your eligibility rule states that only grade 1 employees are eligible for compensation. On March 1 an employee is grade 1, but on April 15 they are promoted to grade 2. On April 16 you run Update all worksheets with the checkbox "Update worksheet to reflect any employee's eligibility changes" selected.
What happens on the worksheet for this employee?