I found the Cisco IOS-EX doesn't support "replace" from its E-DI interface. Only "merge" operation is allowed for "edit_config". This will make override or config replacement very difficult to achieve in my opinion. You may have to use "copy_config" ...

<default-operation>replace</default-operation>The operation will "replace" the entire configuration. Not the individual element for EIGRP.I am still working myself to find a way to orverride or replace the XML elements in NETCONF.Might have more feat...