Employee vacations and work schedule rule

Hello All,

We have a work schedule rule assigned to several employees. When an employee goes on vacation, is there a way to adjust just the employee's planned working time (infotype 0007) for the vacation days? I am not sure if this is done through work schedule rule or some other transaction to book vacation that will update the work schedule rule. The idea is to use workforce planning, in which the employee will be allocated work based on their working time for the week and we need to be able to see how many hours the person is working that week.

Any ideas would be greatly appreciated.