Need some help with "num_whitelist_required" for buffs

Here's the part of the script I'm trying to get working

<V t="buff">

<U n="buff">

<U n="buff">

<T n="buff_type">15426518613237282160<!--buff_Createdaspell--></T>

</U>

<E n="subject">Actor</E>

<L n="tests">

<L>

<V t="trait">

<U n="trait">

<L n="blacklist_traits">

<T>16744878981341132505<!--trait_WildGrowth--></T>

</L>

</U>

</V>

</L>

<L>

<V t="buff">

<U n="buff">

<L n="whitelist">

<T>13864752613113731122<!--Light--></T>

<T>15067059624956226590<!--Energy--></T>

<T>16977434591579340658<!--buff_earth--></T>

</L>

<T n="num_whitelist_required">3</T>

</U>

</V>

</L>

</L>

</U>

</V>

As you can see the number of whitelist traits is 3 but in game it only selects one trait to be required, any help is much appreciated.