Hi,
I am glad its working.
interface based NAT not working in DMZ zone - What I can think of is the use of custom VR's not allowing interface NAT for DMZ.
If it is Trust-VR, interface based NAT works only for trust - Unturst, DMZ- Untrust, for other custom zones, you need to enable it on the policy.
Thanks and Regards,
Pradeep Kumar M