Fixed Duration & effort driven task (strange outcome with Units

Hi, 
Sorry, but I misformulated my problem.
This makes it a bit more clear I hope:
While in a chapter about effort-driven Microsoft says the following:
If the assigned task type is Fixed Duration, assigning additional resources decreases the individual unit values for resources.
Why aren't the units set to 50% after I assigned Peter as 2nd resource?
TIA
L

Hi Guillaume,
Thank you very much for your reply!!!!
I have been chasing my tail about it.
I would have to agree with one of the comments regarding that article: (some parts of it below)
It might have been nice then if Microsoft had carried the Peak field into the Task Details form, as well as others since from these views only display the Assignment Units  is not available in the Task Details view, it just looks like the product is broken.
 Fixed duration 5 day task, 20 hours on each resouce (2 total), shows 100% Assignment units, just doesn't seem very intuitive.
At least now I can let it go (sort of)
The Peak fiels is my saviour I guess but:
I would still would like to understand the logic in when you add 4 resources one by one on a 10 day task the Units go like this:
1st =100%
2nd = 100%
3nd = 50%
4th=33 %
Thanks again!
L

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