This is how I tried to hook the query filter:
function modify_acf_relationship_search_query ($args, $field, $post ) {
$args['meta_query'] = array(
'key'=> '_sku',
'value'=> '$args['s'],
'compare' => 'LIKE'
);
return $args;
}
add_filter('acf/fields/relationship/query/name=related_products', 'modify_acf_relationship_search_query', 10, 3);
Again, this hook doesn’t work, The query always showing no results.