mastrup

Thank you for pointing that out to me, Michael! ??

This solved my problem:

$args = array(
	'post_type' => 'customdocument',
	'tax_query' => array(
		array(
			'taxonomy' => 'customcategory',
			'field'    => 'slug',
			'terms'    => 'customCategorySlug',
			'include_children'	=> 0
		),
	),
);
$query = new WP_Query( $args );