When we set up all of our payroll rules, we had to come up with different sets of rules for different cost centers, based on things like applicable union collective bargaining agreements. We also had other rules that applied to other non-union employees differently, based on hourly vs salary, etc. When we approached our first Thanksgiving week, in which Thanksgiving Day AND Black Friday were holidays for some union employees, but only Thanksgiving Day was a holiday for others, we realized we had some conflicting rules that prevented the correct holiday hours from populating in timesheets. Even changing things manually, the rules wouldn't allow the correct scenario to take place. This wasn't discovered until we were processing the payroll the following week. It was the end of the day and we needed to get the payroll closed, but we couldn't finish because of this issue. We were able to get our payroll rep on the phone and he helped us solve the immediate situation, but also worked with us to tweak the current rules so we wouldn't run into this situation again in the future. It took several minutes of testing out scenarios with a test employee before we figured out how to make it work, but we were impressed with the extra effort to prevent the situation from happening again.