Hi,
Why don't you show the used component as a popup window and pick the customers there? Or if you still want to navigate to the used component and return back, try using Suspend and Resume Plugs.
Check this help for reference: http://help.sap.com/saphelp_nw73/helpdata/en/4b/87c476992b2d1be10000000a42189c/content.htm
hope this helps u,
Regards,
Kiran