TestLink Workflow. Test assignment.

[talkie]

I want to mark some test for execution. When test have been executed - this mark should be dropped.
- how can i do it?

If i assign some test to tester - this assignment doesn't drop after execution.

The purpose is that:
when feature becomes available in some build, i mark test for execution.
Tester executes test, in succeeded builds i do not want to execute the test if it passed.
I will mark test for execution again, if defect was fixed or i am willing to do regress for release candidate.

How can i do that in TestLink?
I use version 1.8.4.

[fman]

Test Link does not work in the way you want.