I am new to LLBLGen Pro and am checking for duplicate, I have the following SQL:

SQL:

select a.TopicId,atc.TopicCategoryId,a.Headline
from article a
inner join ArticleTopicCategory atc on atc.ArticleId = a.Id
where a.TopicId = 'C0064FAE-093B-466E-8745-230534867D2F'
and a.Headline = 'Test'
and atc.TopicCategoryId in ('004D64F7-474C-48F9-9887-17B1E7532A84')

Whenever I step though my function, it always returns 0:

LLBLGen Code:

public bool CheckDuplicateArticle(Guid topicId, List<Guid> categories, string headline)
        {
            ArticleCollection articles = new ArticleCollection();
            PredicateExpression filter = new PredicateExpression();
            RelationCollection relation = new RelationCollection();
            relation.Add(ArticleEntity.Relations.ArticleTopicCategoryEntityUsingArticleId);
            filter.AddWithAnd(ArticleFields.TopicId == topicId);
            filter.AddWithAnd(ArticleTopicCategoryFields.Id == categories);
            filter.AddWithAnd(ArticleFields.Headline == headline);
            articles.GetMulti(filter, 0, null, relation);
            return articles.Count > 0;
        }

Any help would be appreciated!