Problems with my assignments and/or variables?!

[Aus1423]

I'm trying to make a very simple PL/SQL transaction w/up to 3 purchases in a single transaction in portal and I've hit a wall. If I uncomment the below illustrated code, I get errors:

Line No. 44 : PLS-00306: wrong number or types of arguments in call to '=' (WWV-17050 and

ORA-24344: success with compilation error (WWV-11230)

I've even tried ':=' where I have the >> instead... but it still doesn't work. Am I assigning wrong? Please help me out.

EDIT: I realized this is probably the wrong forum for this. I apologize in advance. Thanks

(
emp_id IN NUMBER,
cust_id IN NUMBER,
tran_paymenttype IN VARCHAR2,
inv_id_input1 IN NUMBER,
inv_id_input2 IN NUMBER,
inv_id_input3 IN NUMBER)

as
temp_transseqnum number(6);
temp_sysdate date;
--item1 number (5, 2);
--item2 number (5, 2);
--item3 number (5, 2);

--trans_total number (6, 2);
begin

select trans_id.nextval
into temp_transseqnum
from dual;

select sysdate
into temp_sysdate
from dual;

insert into transaction
(tran_id, emp_id, cust_id, tran_datetime, TRANPAYMENTTYPE)
values
(temp_transseqnum, emp_id, cust_id, temp_sysdate, tran_paymenttype);

update inventory set inv_quantityinstock = inv_quantityinstock - 1
where inv_id = inv_id_input1;

update inventory set inv_quantityinstock = inv_quantityinstock - 1
where inv_id = inv_id_input2;

update inventory set inv_quantityinstock = inv_quantityinstock - 1
where inv_id = inv_id_input3;

--select cata_rentalprice
--into item1
--from catalog
>> --where inv_id = inv_id_input1;

--select cata_rentalprice
--into item2
--from catalog
>> --where inv_id = inv_id_input2;

--select cata_rentalprice
--into item3
--from catalog
>> --where inv_id = inv_id_input3;

--trans_total := item1 + item2 + item3;

exception
when others then
htp.p('PROC_TRANS_INV: ' || sqlcode || ' ' || sqlerrm);htp.br;

end;