OLEDB Provider 8.1.7.3 trims trailing spaces

Question

We are testing 8.1.7.3 for our client who has problem with 8.1.7.0 provider
We have discovered that 8.1.7.3 trims trailing spaces when passing parameters to stored procedures.
like in the following sample when calling procedure using ADO and setting parameter to anything like
AParameter.Value:='A2 ';
test table is populated with just 'A2' string - trailing spaces are lost.
It was working OK with version 8.1.7.0
Create table test(code VarChar2(30));
Create or replace procedure testProc(code VarChar2) as
begin
Insert Into Test(Code) Values(Code);
-- NULL;
end;

Answer 1

oh ... I forgot to say ..
when I run query under Enterprise Manager as
select * from Openquery (db, 'select * from table')
then it will show me a pop-up message
"Query Designer encountered a MS Design Tools error:
ODBC error: [Microsoft][ODBC SQL Server Driver][SQL Server]OLE DB provider 'OraOLEDB.Oracle' reported an error.
[Microsoft][ODBC SQL server Driver][SQL Server][OLE/DB provider returned message: ORA-12545: Connect failed because target host or object does not exist]
And I follow support.microsoft.com/support/complus/mtsandoracle.asp?SD=GN&LN=EN-US&gssnb=1,setting as follow
[HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\MSDTC\MTxOCI]
"OracleXaLib"="oraclient8.dll"
"OracleSqlLib"="orasql8.dll"
"OracleOciLib"="oci.dll"