NAT on a BOVPN Virtual with BGP

I have a BOVPN Virtual Interface with BGP. The admin at the remote end wants me to NAT my private network to an IPv4 range that works for him. I've used NAT on non-virtual BOVPN by configuring it in the Tunnel Route Settings. For BOVPN Virtual, on the VPN Routes tab, I do not have an option to specify NAT info. How can I do this?

Firebox M390 running Fireware 12.11.4

Any help would be appreciated.

Frank

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