TestLink

Filter TestCase Assignment by Tester: show only what is assigned to his platform

Hello,
I would like to ask for help with following "problem":
Precondition:
* TC1 is assigned to 2 testers:
-TESTER1 to be executed on PLATFORM1 and
- TESTER2 to be executed on PLATFORM2.

Our teamleader requires to use a filter in the TestCase assignment window "TestCases assigned to TESTER1".
The problem is, that filtered testcase TC1 is "opened", it is shown as assigned to:
- TESTER1 on PLATFORM1
- TESTER2 on PLATFORM2

Is there an option to hide all other testers with their platforms from this list?
Or shall I report it to TL Mantis as feature request?

Please observe the attached image to see it "in real".

there is absolutely no such concept as HIS/HER Platform.
and there is no feature that allow a tester be linked to a platform.