Extending item is not working

[The_Great_Sephiroth]

I'm working on another version of the MP5 and am trying to extend the one already in-game so I need only specify the new mesh file when it is complete. However, it isn't copying attributes when extending and preventing the new one from loading. Not sure what I am doing wrong.

<DHTA_MP5SD>
    <append xpath="/items">
        <item name="DHTA_MP5SD" extends="gunHandgunT3SMG5">
            <effect_group name="DHTA_MP5SD" extends="gunHandgunT3SMG5">
                <passive_effect name="MaxRange" operation="base_set" value="50" tags="perkGunslinger,9mmGun"/>
                <passive_effect name="DamageFalloffRange" operation="base_set" value="28" tags="perkGunslinger,9mmGun"/>
                <passive_effect name="EntityDamage" operation="base_add" value="15" tags="perkGunslinger"/>
            </effect_group>
        </item>
    </append>
</DHTA_MP5SD>

It wants me to specify the mesh file. It should inherit that. If I specify it, it asks for a material. Why isn't it inheriting the base data?

 

[seven]

There are things that don't "extend". Tags, drop events, and I believe effect_groups are among those. But I'm not an expert, and perhaps there is a way. I end up repeating those items when I extend something.

 

[The_Great_Sephiroth]

Is there a way to know what will and won't extend?

 

[seven]

If there is I'd like to know too. There's a comment in the xml about the tags property, and the creativemode property, but that's the only documentation I've found that I recall. I asked here a year ago and never got any answers. Maybe someone else can add to this.