Hi Sironi,

Can you please try this.

var ReleaseKnowledgeArticle = Class.create();
ReleaseKnowledgeArticle.prototype = {
    initialize: function() {},

    CheckStory: function() {
        var arr = [];
        arr.push(current.release.number.toString() + " " + current.release.short_description.toString());

        var results = '';
        var story = new GlideRecord('rm_story');
        story.addQuery('release', current.release);
        story.addEncodedQuery("state=3");
        story.query();
        while (story.next()) {
            arr.push(story.number + ": " + story.short_description);
            arr.push("Release Notes : " + story.u_release_notes.toString());
        }
        results= arr.join("\r\n");

        var kb = new GlideRecord('kb_knowledge');
        kb.addQuery('source', current.release);
        kb.query();
        if (kb.next()) {
            this._UpdateKB(results);
        }
    },

    _UpdateKB: function(results) {
        var art = new GlideRecord("kb_knowledge");
        art.addQuery("source", current.release);
        art.query();
        if (art.next()) {
            art.text = results;
            art.update();
        }
    },
    type: 'ReleaseKnowledgeArticle'
};

Regards,
Rahul