Data not updating in database

Question

Friends i have table and i have created a sequence on basis of that table.
For 1st page i have created an html region and made few items there and a save button.
I am filling data to the fields in page 1 and clicking the save button. In save button i have passed the address of the items of 1st page to items of 2nd page which contains the same field of page 1 and few more additional field.
the 2nd page which i have made is on basis of form on a table or view and taken exsisting sequence there. When i clicking the submit button in page 2 it is not updating my database and throwing error called unable to fetch row. Any suggestions on this?

Answer 1

Lev addition to this i wanted when my create button in 2nd page get clicks my database gets updated and also a query runs which checks the same data of combination variant_type,model_code,year_manuafacture. It means if i have 2 records in database with same variant_type,model_code,year_manufacture then in the field how_many in page 2 count of 3 gets updated and the other field solution avaiable get updated with Y.
For this in my local system in page 2 i created a plsql process and wrote this code and applied it with create button but its not working. Any idea where i am failing?
Declare
l_how_many Number;
l_sol_av Varchar2(1):= NULL;
Begin
select count(*)
into l_how_many
from quality
where 1=1
and variant_type= :P2_VARIANT_TYPE --'Road Bike'
and model_code = :P2_MODEL_CODE --'6'
and year_manufacture= :P2_YEAR_MANUFACTURE  ; --'2000'
If l_how_many=null then
    l_sol_av := 'N' ;
else
    l_sol_av := 'Y';
end If ;
:P2_SOLUTION_AVAILABLE := l_sol_av;
:P2_HOW_MANY_RAISED       := l_how_many;
Exception
    when no_data_found then
    null;
end;