BizTalk Code page value for Chinese Characters

Hello,

I working on a project where SAP sends an IDOC to BizTalk.
IDOC contains some Chinese characters along with ENglish characters.
When I receive the IDOC in BizTalk I see that Chinese charaters are 
converted to "???".
I feel this may be related to BizTallk Code page property in Receive 
location in SAP configuration peroperties. I am not sure.
if it is related to BizTalk code page property, can some one tell what
value 
needs to be set.
If any one has Idea how I can have the Chinese charaters as it is in my
IDOC 
XML.

Thanks in advance.
Sunil