/**
  * returns the fact wether the feedback editing form has to be saveable or not.
  * this depends on the additional content editing mode and the current question type,
  * as well as on fact wether the question is writable for current user or not,
  * or the fact if we are in self assessment mode or not
  * 
  * @access private
  * @return boolean $isFormSaveable
  */
 private function isFormSaveable()
 {
     $isAdditionalContentEditingModePageObject = $this->questionOBJ->isAdditionalContentEditingModePageObject();
     $isSaveableInPageObjectEditingMode = $this->feedbackOBJ->isSaveableInPageObjectEditingMode();
     if ($isAdditionalContentEditingModePageObject && !$isSaveableInPageObjectEditingMode) {
         return false;
     }
     $hasWriteAccess = $this->access->checkAccess("write", "", $_GET['ref_id']);
     $isSelfAssessmentEditingMode = $this->questionOBJ->getSelfAssessmentEditingMode();
     return $hasWriteAccess || $isSelfAssessmentEditingMode;
 }