Since I do not have the description of your table, or the error number and error description or your Oracle database version, or the scenario that generates the error I can only guess that the error may be related to a violation of column size or datatype.

Moreover, in order to get more help, I suggest you join the oradev mailing list and ask your question(s) there (with more details).

My code is as follows.

declare 

v_kit_num     varchar2(20);
v_vouch_num_seq    number(4);
v_vouch_num        varchar2(14);
v_qty_order        number;
v_order_date       date;
v_comment          varchar2(42);
v_sup_stock_num    varchar2(15);

begin 

 v_kit_num := :icb_kats_kits.kit_num;
 v_vouch_num_seq := null;
 v_order_date  := :icb_kats_order.order_date;
 v_vouch_num   :=  :icb_kats_order.vouch_num;
 V_qty_order   := :icb_kats_order.qty_order;
 v_comment     := :icb_kats_order.comment_ord;
 v_sup_stock_num := :icb_kats_order.sup_stock_num;

insert into ict_kats_order1
(kit_num, vouch_num, qty_order, order_date, sup_stock_num, comment_ord) 
values 
(v_kit_num, v_vouch_num, v_qty_order, sysdate, v_sup_stock_num, v_comment);

COMMIT;

END;