Released product details - Overdelivery and underdelivery

Hi

I fairly new to AX and currently I am creating product details in the system.

I the tab Purchase, I find Overdelivery and Underdelivery - I found that the field are in % - Correct me if I am wrong.

My question is:

Does the value in the field +/-100% or +/- 0%? 

(For example if i write 15 in Overdelivery does that mean maximum 115% total or 15% delivered of the total ordered quantity - And in Underdelivery if I write 85 does mean minimum 185% or 85% of the total ordered quantity?)

So how shall the field be filled?

I have the same question for the fields in "sell". 

Thanks in advance