double-byte parameter passing on integrating SAP WinGui Transaction from EP

Hellow,

We got a multiple character set problem when we pass parameter value in Korean to SAP WinGui Tcode from EP 6.0.

Here is our code.

<form name="sapOpen" method="post" action="/irj/servlet/prt/portal/prtroot/com.sap.portal.appintegrator.sap.bwc.Transaction">

<input type="hidden" name="System" value="SAP_ECC">

<input type="hidden" name="TCode" value="ZTCDXXX">

<input type="hidden" name="GuiType" value="WinGui">

<input type="hidden" name="ApplicationParameter" value="docstr=Korean한글입니다123">

</form>

When we submit the above form, the SAPGUI appears with Korean char is broken, which is like this "Korean?????123" .

When we use the ITS, the Korean is not broken.

( http://myecc:8000/sap/bc/gui/sap/its/webgui?sap-client=700&sap-user=11111111&sap-password=22222&sap-language=KO&~transaction=*ZTCDXXX%20docstr=Korean한글입니다123 )

Any suggestion?

Thanks in advance.