About Convert Issue From AS400 To SQL Server 2005

Hi all,
I have a issue need your great help. Would you please help to check it and tell mw how to fix this issue? Thanks.

*****All of softwares are English version****
Server:
WIndows Server 2003 SP2 + SQL Server 2005 SP2
AS400:
V5R4

Client :
Winsows XP SP2 + SQL Server 2005 SP2
Client Access V5R4 Full Version.
*****All of softwares are English version****

Issue:
I have a file in the AS400 with Chinese characters and need to dowload to SQL Sever 2005 daily.
In the SQL Server, I created a database and table which collection is "SQL_Latin1_General_CP1_CI_AS", and I modified one of field which collection is from "SQL_Latin1_General_CP1_CI_AS" to "Chinese_Taiwan_Stroke_CS_AS" (( the filed data type is "nvarchar" and the length is 42).
That mean that field can display the Chinese characters correctly.

In the SSIS,
1.Craeted a OLE DB Source to get the data ( The field name is "CUST_CHINESE_NAME" and the length is 42) from AS400
2.Craete a Data Conversion to convert that field from "String" to "Unicode String[DT_WSTR]" (The new field name is "Copy of CUST_CHINESE_NAME")
3.Create a Data Conversion 1 to convert that field from "Unicode String[DT_WSTR]" to "String[DT_STR]" and code page is change to "950"(The new field name is "Copy of Copy of CUST_CHINESE_NAME")
4. Creatd a OLE DB Destination to get that convert data and input the SQL Server ( the filed data type is "nvarchar" and the length is 42).


When I execute that SSIS, I got the error message in the third step.
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[Data Conversion 1 [521]] Error: Data conversion failed while converting column "Copy of CUST_CHINESE_NAME" (487) to column "Copy of Copy of CUST_CHINESE_NAME" (544). The conversion returned status value 4 and status text "Text was truncated or one or more characters had no match in the target code page.".

[Data Conversion 1 [521]] Error: The "output column "Copy of Copy of CUST_CHINESE_NAME" (544)" failed because truncation occurred, and the truncation row disposition on "output column "Copy of Copy of CUST_CHINESE_NAME" (544)" specifies failure on truncation. A truncation error occurred on the specified object of the specified component.

[DTS.Pipeline] Error: SSIS Error Code DTS_E_PROCESSINPUTFAILED. The ProcessInput method on component "Data Conversion 1" (521) failed with error code 0xC020902A. The identified component returned an error from the ProcessInput method. The error is specific to the component, but the error is fatal and will cause the Data Flow task to stop running. There may be error messages posted before this with more information about the failure.

[DTS.Pipeline] Error: SSIS Error Code DTS_E_THREADFAILED. Thread "WorkThread0" has exited with error code 0xC020902A. There may be error messages posted before this with more information on why the thread has exited.
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