[SOLVED] can't save transaction without details

Code:
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class Users_db extends Model {



    function Users_db()

    {

        parent::Model();

    }

function getCompanyDetails($data)

    {

        $this->db->where($data); 

        return $this->db->get('maint_company')->row_array();        

    }



function getDetailList($ids) //Show the list of registered user with company details

    {

        $item=$this->input->post('item');

        $id = $this->input->post('ids'); //cess code added

        

        $page = $this->input->post('page');

        $limit = $this->input->post('rows'); // get how many rows we want to have into the grid 

        $sidx = $this->input->post('sidx'); // get index row - i.e. user click to sort 

        $sord = $this->input->post('sord'); // get the direction



        if (!$sidx) $sidx = 'sec_companyaccess.user_id'; // if we not pass at first time index use the first column for the index

        if (!$sord) $sord = 'desc';    

        



        

        if (!$page) $page = 1;

        if (!$limit) $limit = 25;

        

        $start = (($page-1) * $limit);

        

        $this->db->start_cache();

        



        $this->db->join('maint_company','sec_companyaccess.company_id=maint_company.company_id','left');

        $this->db->join('sec_users ','sec_companyaccess.user_id=sec_users.user_id','left');

        //$item = $this->input->post('sec_users.user.id');

        $this->db->from('sec_companyaccess');

        $this->db->where("sec_companyaccess.user_id", $ids);//cess code added

        $count = $this->db->count_all_results(); //code added by cess

    

        

        // calculate the total pages for the query - code added by cess

        if( $count > 0 && $limit > 0) { 

              $total_pages = ceil($count/$limit); 

        } else { 

              $total_pages = 0; 

        } 

        

        // if for some reasons the requested page is greater than the total 

        // set the requested page to total page - code added by cess

        if ($page > $total_pages) $page=$total_pages;

        

        // calculate the starting position of the rows

        $start = $limit * $page - $limit; // do not put $limit*($page - 1)

        

        // if for some reasons start position is negative set it to 0

        // typical case is that the user type 0 for the requested page

        if($start <0) $start = 0;         

        

        

        $this->db->select("sec_companyaccess.company_access_id as pkey,sec_companyaccess.company_access_id, maint_company.company_code, maint_company.company_name,sec_companyaccess.company_id ");

        

        $this->db->order_by($sidx,$sord);

        

        //$this->db->limit($rp, $start);

        $query = $this->db->get("sec_companyaccess");

/*        $sql = ("SELECT erp_sec_companyaccess.company_access_id as pkey,erp_sec_companyaccess.company_access_id, erp_maint_company.company_code, erp_maint_company.company_name,erp_sec_companyaccess.company_id                

        FROM erp_sec_companyaccess

        INNER JOIN erp_sec_users

        ON erp_sec_companyaccess.user_id= erp_sec_users.user_id

        LEFT JOIN erp_maint_company

        ON erp_sec_companyaccess.company_id=erp_maint_company.company_id

        WHERE erp_sec_companyaccess.user_id= erp_sec_users.user_id");

        $query = $this->db->query($sql);

        $num = $this->db->count_all_results();*/

        $this->db->flush_cache();

        

        $data['db'] = $query;        

        $data['page'] = $page;

        $data['totalpages'] = $total_pages;//code added by cess^^

        $data['totalrecords']=$count; //- code added by cess

        return $data;            





    }



    

    function save_companydetail($details,$id) 

    {



        $this->db->insert('maint_company', $details);

        $DataId = $this->db->insert_id();

        $data['user_id'] = $id;

        $data['company_id'] = $DataId;    

        $this->db->insert('sec_companyaccess', $data);

    }