I am using P6 Professional 8.3 and I'm having issues with the Resource - Max units / time allocation. I enter an effective date to start assigning 8 hours per day (Max units / time) for a activity, and then another effective date later on to start assigning 2 hours per day to the same activity, but it doesn't show up or update the Resource usage profile or in the Resource assignments field. I can input the hours per day manually in Resource Assignments but this is not a great solution. What am I doing wrong?