“The Access Policy has externally been modified and cannot be changed by Studio” warning message

After setting access policy rule, “Access Policy” option in “Edit Delivery Group” dialog cannot display. ------------------------ Add-PSSnapin -Name Citrix. Set-BrokerAccessPolicyRule 'AG' -IncludedClientIPFilterEnabled $True Set-BrokerAccessPolicyRule 'AG' -IncludedClientIPs xxx.xxx.xxx.xxx...