ORA-06502 in pl/sql code after converting from 9i to 10g

Code worked in 9i, fails in 10g (v10.1.2.0.3) with "character buffer too small":
v_period varchar2(6);
select max(period) into v_period from fiscal_periods;
PERIOD in the table is CHAR(6), representing yyyymm.
I've discovered two workarounds:
1) Declare v_period as varchar2(4000), nothing smaller works
or
2) select TRIM(max(period)) into v_period from fiscal_periods;
The code worked okay in 9i, so is there a 10g change in variable handling I've missed? Or possibly bad programming form? Database vars NLS_SORT (blank), NLS_COMP (blank), and NLS_LANGUAGE (American) are set the same in 9i and 10g, all defaults.

Thanks for your speedy response. The version is 10.2.0.1.0 according to Grid Control, so I assume 10.2.0.2 trumps it. (The previous version number I provided was the result of "select owa_util.get_version from dual;" in SQL Developer so it might be the SQL Worksheet version?) I'll get this info to the dba and we'll see what happens.
Thanks!

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903714 wrote:
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ORA-06502 in pl/sql code after converting from 9i to 10g

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