protected function normalizeFilter()
    {
        $this->substituteField($this->filter, 'GROUPS', 'GROUPS_ID');
        $this->substituteField($this->filter, 'GROUP_ID', 'GROUPS_ID');

        return $this->filter;
    }
protected function normalizeFilter()
    {
        $this->substituteField($this->filter, 'GROUPS', 'GROUPS_ID');
        $this->substituteField($this->filter, 'GROUP_ID', 'GROUPS_ID');

        return $this->filter;
    }
protected function normalizeFilter ( ) { $ this -> substituteField ( $ this -> filter , 'GROUPS' , 'GROUPS_ID' ) ; $ this -> substituteField ( $ this -> filter , 'GROUP_ID' , 'GROUPS_ID' ) ; return $ this -> filter ; }
Normalize filter before sending it to getList.
This prevents some inconsistency.

@return array
Normalize filter before sending it to getList . This prevents some inconsistency .