Multiple "implemented by" RTCproject to a single R

hi,

I've configured RRC-RTC integration. and Linked 2 RTC project to a single RRC project.
When I want to link a requirement with 2 tasks that each task is in different linked RTC projects. But the problem occurs.

If I select the RTC project from the implemented by window that is the first linked project in project admin page I can connect to it. But when I select the other RTC project that is the second order in link area in project admin page
it says create repository connection, click on this write user/pass but I doesn't say or show anything.

Is it a bug or it is not allowed to add 3 implemented by project to a single req. project?

regards.
Halil