Cannot import Real work to Ticket

public function saveWork() {
    if ($this->id) { // update existing work
      $old=$this->getOld();
      $result=$this->save();
      $this->updateAssignment($this->work-$old->work);
      return $result;
    } else { // add new work
      if (! $this->idResource and ! $this->idAssignment) { // idResource Mandatory
        return "ERROR idResouce mandatory";
      }
      if (! $this->workDate) { 
        if ($this->day) {
          $this->workDate=substr($this->day,0,4).'-'.substr($this->day,4,2).'-'.substr($this->day,6,2);
        } else { // Work Date is mandatory
          return "ERROR workDate mandatory";
        }
      }
      if (!$this->idAssignment) { // unknown assignment
        if ($this->refType and $this->refId) {
          $crit=array('refType'=>$this->refType,'refId'=>$this->refId,'idResource'=>$this->idResource);
          $ass=SqlElement::getSingleSqlElementFromCriteria('Assignment', $crit);
          if ($ass->id) {
            $this->idAssignment=$ass->id;
          } else {
			$crit=array('refType'=>$this->refType,'refId'=>$this->refId);
            $tick=SqlElement::getSingleSqlElementFromCriteria('WorkElement', $crit);
			if ($tick->id) {
				$this->idWorkElement=$tick->id;
			} else {
				return "ERROR either idAssignment or idWorkElement is mandatory"; // could not retrieve assignment, so is mandatory
			}
          }
        }
      } else { // refType & refId can be retreived from assignment
        $ass=new Assignment($this->idAssignment);
        $this->refType=$ass->refType;
        $this->refId=$ass->refId;
        $this->idResource=$ass->idResource;
      }
	  if ($this->idAssignment) {
		  $crit=array('idAssignment'=>$this->idAssignment,'workDate'=>$this->workDate); // retreive work for this assignment & day (assignment includes resource)
		  $work=SqlElement::getSingleSqlElementFromCriteria('Work', $crit);
	  }
	  else {
		  $crit=array('idWorkElement'=>$this->idWorkElement,'workDate'=>$this->workDate); // retreive work for this assignment & day (assignment includes resource)
		  $work=SqlElement::getSingleSqlElementFromCriteria('Work', $crit);
	  }
      if ($work->id) {
        $work->work+=$this->work;
        $result=$work->save();
        $work->updateAssignment($this->work);
        return $result;
      } else {
        $this->setDates($this->workDate);
        $result=$this->save();
        $work->updateAssignment($this->work);
        return $result;
      }
    }
  }