Hi all, 

We noticed that when we create a PO and then change the quantity of a line item in that po the expected arrival date for that line item and for the complete PO changes automaticly. 
However we would like this date to not change. because that date is always wrong. 

It takes the delivery time in the purchase tab of the product. And then subtracts 7 days from it. So sometimes the expected delivery date is in the past. 

How do I dissable this? 

Kind regards and thanks