Enterprise manager nls problem

I create sample function in sql:

CREATE OR REPLACE function proba return number as
--čćžđšČĆŽĐŠ sample text
begin
return 9;
end;


And open it in em:

return number as
--čćžđšČĆŽĐŠ sample text
begin
return 9;
end;

It is OK, but after edit/compile in em I get this:

return number as
-- ?� ?� ? ?� ? ?� ?� ? ?� ? sample text
begin
return 9;
end;

Why?



Version and nls settings:

SQL> select version from v$instance;

VERSION
-----------------
10.2.0.2.0



SQL> select * from v$nls_parameters;

PARAMETER
----------------------------------------------------------------
VALUE
----------------------------------------------------------------
NLS_LANGUAGE
CROATIAN

NLS_TERRITORY
CROATIA

NLS_CURRENCY
kn

NLS_ISO_CURRENCY
CROATIA

NLS_NUMERIC_CHARACTERS
..,

NLS_CALENDAR
GREGORIAN

NLS_DATE_FORMAT
DD.MM.RR

NLS_DATE_LANGUAGE
CROATIAN

NLS_CHARACTERSET
EE8MSWIN1250

NLS_SORT
CROATIAN

NLS_TIME_FORMAT
HH24:MI:SSXFF

NLS_TIMESTAMP_FORMAT
DD.MM.RR HH24:MI:SSXFF

NLS_TIME_TZ_FORMAT
HH24:MI:SSXFF TZR

NLS_TIMESTAMP_TZ_FORMAT
DD.MM.RR HH24:MI:SSXFF TZR

NLS_DUAL_CURRENCY
kn

NLS_NCHAR_CHARACTERSET
AL16UTF16

NLS_COMP
BINARY

NLS_LENGTH_SEMANTICS
BYTE

NLS_NCHAR_CONV_EXCP
FALSE

.

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