Position Assignment issue with A008

Hi Experts.

I have a problem of assigning more than one person in a position

In the config i give A008 relationship with 3 as time constant

and while assigning person i am using assignment percentage

like.. 50 % and 50% for 2 persons. it is working but it allows more the 2 persons with 50 % assignment .

So i thing there is no check on the Percentage field.

please let me know the config. how to restrict the position with 100 % with any no of person.

Thanks..

Avik