Contact Person list in Solman FrontEnd

Hi Guys,

I have couple of issues.

1) How do I control the contact Person list in solman frontend?

When client user login to our solman to open an incident in the "Contact Person" list they see all the users of the system including other clients name. I want to limit it to see only those users of their organization and our organization. How do I achieve this? Please see the screen shot below.

2) We have list of users which came up here who are not exist in the GUI. I have deleted those users using T-Code SU01 but still no luck. Any Idea, how do I remove it from that list?

Any idea?

Thanks,

Charly