Solman 7.1 (Business Partner) Adding Member to CRM Group; Error : Maintenance is only possible Via Organization Management

Hi Gurus,

We have already ticket system in Solman 7.1 . I want to add a member to our CRM group. We have only 2 members at CRM group, but when i trying to add the third one it give error : Maintenance is only possible Via Organization Management

Also i added this member at ppoma_crm tcode to my CRM group, but I can not see I added the third person in CRM group when i open or editing the ticket ?

Could you please help me ?

Regards