Sales Order Updated by

Hi Experts,

If anyone can assist me to achieve this..

I have two users  user1 & user2

User1 creates sales order then it goes to user2,  then user2 either amend the unit price or discount and then update the sales order.

I want a list of those sales orders which has been updated by user2 at the end of the day.

I have managed to create a query but this one gives me user1 not user2.

Rgds

Suman