OK,

If you go into the process configuration tab for your project, and navigate to Team Configuration -> Operation Behavior, you will see a bunch of operations that you can trigger events on. Scroll down that list until you get to Source Control -> Deliver (Server). Then check the preconditions box, and ADD the Require Work Item Approval pre-condition. Once you have added this, you should then configure it by filling in the Required Approvals that you want to see. This is done based on role, so for a code review you should have at least one person in the developer role code review and mark the work item as approved.

For defect approvals/verification, the operational behavior is under Work Items -> Save Work Item (Server), and the precondition that you need to add is called Required Approvals. Just select the Defect work item type, and the states where a verification approval is needed.

Using these two operational behaviors should give you what you are looking for.

Doesn't seems to be working :(

In Process Configuration -> Team Configuration -> Source Control -> Deliver (server) I've defined following condition for Everyone: "Require Work Item Approval". In "Required Approvals" I've added "Review: 1 Developer".

I'm working in Eclipse RTC 3.0 Client, "formal" process template. There are two users in the same team, both have roles "Developer" in that team.

First user created a defect, moved it into "In Progress" state, performed code changes, checked-in files into a new changeset, associated it with this defect. Added approval of type "Review", added second user as Approver. Saved the defect. Logged in as second user, changed approval state to "Approved". Saved the defect. Logged in as first user and tried to deliver the changeset.

Result: "Missing approval prevents delivery: Work item 26 is missing 1 approval of type "Review" (Developer role)".

UPDATE: everything works when I'm not working with team members. With developers, that belong to project itself and not to the team it's OK.

Did you change the operation behavior for the team area or the project area?

It's impossible to change operation behavior related to Source Control in process area. The only operation behaviors that available for customization there are Dashboards (save personal dashboard/save project dashboard).

Here's exact scenario of configuration that I've done:

1. Right click on project name in Team Artifacts, choose "open".
   
2. Choose "Process configuration" tab at the bottom.
   
3. Expand "Team Configuration" tree.
   
4. Choose "Operation Behavior".
   
5. Scroll down, expand "Source Control" tree.
   
6. Click on intersection of "Everyone" column and "Deliver (server)" row.
   
7. Check "Preconditions and follow-up.." checkmark.
   
8. Press "Add" button and choose "Require Work Item Approval".
   
9. In "Required approvals:" area press "New" button.
   
10. Choose "Review: 1 Developer".
    
11. Save the project.