How to add "Option 150" to a DHCP Scope in IPAM 3.1.1??

Hello

Thank you for your time. I'm in a project to manage all the DHCP Servers (Cisco and Microsoft) in the IPAM platform in order to let the Network Administrators manage the Microsoft DHCP Servers without the help of the systems administrators, so , I have done all the test but it left 1 last thing and is the  "Option 150" used for the IP Cisco phones. I don't know how to configure it. In the section "Scope Options" doesnt appears the button to add new options. I have IPAM version 3.1.1 and Orion Core 2012.2.1.

I would really appreciate your help to solve this problem

Thanks