Organization Management , IDES SAP CRM

Hi Friends, I was working with Organization Management in SAP CRM IDES 7.0 version. Some Organizations already existing in the System one of those is IDES CRM Training Company and it is mapped with ECC organization 2200.Now when I was working in SAP CRM with IDES CRM Training Company by mistake in Function Tab , R/3 organization field which was set to 2200 got deleted by me and now its empty. When I try to re enter the value it says RFC connection is required. As I am working with IDES System and only with SAP CRM, its not possible for me to get data from ECC. So is there a possibility that I can re enter R/3 Organization ? If Yes can somebody help me how to do so ?