SELECT int_col.order_no, int_col.line_no, int_col.rel_no, int_col.line_item_no
      FROM Purchase_Order_Line_Tab pol
           INNER JOIN Customer_Order_Line_Tab int_col ON  int_col.demand_order_ref1 = pol.order_no
                                                      AND int_col.demand_order_ref2 = pol.line_no
                                                      AND int_col.demand_order_ref3 = pol.release_no
      WHERE
         pol.demand_order_no = order_no_ 
         AND pol.demand_release = line_no_
         AND pol.demand_sequence_no = rel_no_
         AND pol.demand_operation_no = line_item_no_;