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Currently the "Ip.version" attribute is required when specifying the IP address of a network attachment. But the version can and should be inferred from the IP address itself.
The fix for this issue should be included in oVirt 4.1.0 beta 1 released on December 1st. If not included please move back to modified.
Verified on - 4.1.0-0.2.master.20161210231201.git26a385e.el7.centos