I try to create a page with a list of documents and add filtering to the list.
Documents structure looks like this:

```
/content/documents/web/sale-exclusives/
    <node name> [web:saleexclusive]
        web:exclusive [web:exclusive] (@web:year)

```

So, there are root documents of type `web:saleexclusive` that have compound children of type `web:exclusive` with attribute `web:year`.
I want to filter documents of type `web:saleexclusive` by `web:year` attribute of it's child compound node.

To achive this I extend `EssentialsListComponent` and override `contributeAndFilters` method like this (just for test):

```
@Override
protected void contributeAndFilters(List<BaseFilter> filters, HstRequest request, HstQuery query) {
    Filter filter = query.createFilter();
    try {
        filter.addGreaterOrEqualThan("web:exclusive/web:year", 1900L);
        filters.add(filter);
    } catch (FilterException e) {
        LOGGER.error("", e);
    }
}

```

The problem is that I'm getting an empty result, although there are documents with web:year > 1900. Without the filter I'm getting all documents under `sale-exclusives`.

The filter above produces following XPath query:

```
//*[(@hippo:paths='79a713cf-294d-4e99-9d63-fc50db10e43f') and (@hippo:availability='live') and not(@jcr:primaryType='nt:frozenNode') and (web:exclusive/web:year >= 1900)] order by @jcr:score descending

```

Filtering by own attributes of `web:saleexclusive` works fine.

How can I fix that?