Help: How to enable DiffServ on an ARN?

I have a Nortel Advanced Remote Node here, am using Site Manager, and/or terminal & BCC to try to set it up. Have got it's interfaces configured, have got OSPF running, all very good.

Would like to configure some QoS - but in Site Manager the DiffServ option is greyed out!

How do I enable DifffServ on an ARN?

Thanks in advance!

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