You must assign a baseline loaded with the same resource in order for the WBS summary to roll up the activities schedule % value.

Hello,
Another solution is to make a global change that sets your actuals equal to the earned value. This can only be used if you’re not using actuals for cost tracking.
Example if your % complete is 10% and you’ve a budget of 100 hr’s the actuals will be 0.10*100 = 10 Hours you also should set your remaining hours on budget-actuals so your hours at completion equals your budget. If you have a variance your percentage complete will change.

I actually wrote a paper to my planners when they raise this issue.

To keep it short, if I have two activity
Activity 1 Budget $100 10hrs 30% complete actual $0
Activity 2 Budget $10 100hrs 100% complete actual$1

What the roll up will be
the answer will be 10/110 9%
Why ... simple, under the P3e physical % basic rules you cannot earn any physical value unless you spend $ on the activity as a result, the physical value earned in activity 1 = 0 therefore the summary shows % as 9% instead of 37%.

But there is a catch, P3e will show EV for the summary as 40 and that will confuse a lot of user especially when you try to roll up you % without entreing actual $ to the activity.

A way to overcome this is to run a global change to assign $0.1 to all activities. If you want to know a bit more send me an e-mail I can send the presentation that will help you to understand what is the logic behind it.