How can I show the correct word?

I run this script.
create table a (c1 nvarchar2(10));
insert into a values ('aaaa');
Then I make data block about table a,then query it in a base form. But when I execute,the result is "####" instead of "aaaa".
Does anybody can tell me why and how to resolve? Thanks so much.
My environment is:
Oracle 9i Database 9.2.0.1.0
Form builder 6.0.8.11.3
WIN2K Advanced Server English Version
System Default Language is: simplified Chinese
Database Character set is default when setup.

Thanks Carlos Gongora
I have try to make canvas->frame->item->property->data->Maximun length The same as the length of the column in table. But it doesn't work.
See this.
create table t2 (c1 char(1), c2 char(2), c3 nchar(1), c4 nchar(2));
insert into t2 values ('a', 'bb', 'c', 'dd');
then the query result is "a, bb, #, ##"
maybe the problem is in unicode.
But I still can't correct it.

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