Monitor bandwidth usage on Juniper Firewall

Hello.

I have configured a Juniper Firewall with OpManager 7.2. I have enabled SNMP on the firewall, so I can obtain data from OpManager.

OpManager has created the interfaces that my firewall has, but I have one problem with the bandwidth usage, OpManager doesn't correctly show the in/out bytes.

I suppose that the problem is that Juniper doesn't follow the oid standards about the information of the interfaces.

I have downloaded the MIB of the Juniper and have uploaded it into OpManager, so I can now obtain that info.

The problem is that I don't want to create a custom monitor for each interface and for each flow (in/out). I would like to edit the default oid that OpManager uses to obtain the data about the interfaces, but I don't know where is that info stored.

Can you tell me which XML file must I edit?

Thanks.