Database Adapter: NVARCHAR2 datatype in stored procedure

Hi,
when I try to define partner link as database adapter - call stored procedure with datatype NVARCHAR2, I'm getting following error:
Error while writing wsdl file .....
Exception: WSDLException: faultCode=OTHER_ERROR: Database type is either not supported or is not implemented. Parameter INP_TEL is of type NVARCHAR2 which is either not supported or not an implemented datatype.
Is it possible to wokaround this problem without changing datatype nvarchar(utf16) to varchar2(iso8859p2)?
There should be no difference between mapping of varchar and nvarchar to string at BPEL side.
BPEL version: 10.1.2.0.0
Regards
Karel

Better workaround is to define stored procedure with varchar datatype, generate wsdl
and then change stored procedure definition to nvarchar.
This works and mapping (java) string to (oracle) nvarchar2 is correct.
But sometimes this could be difficult ( invalidations of thousands objects).
Maybe there could be better solution like add mapping to some files ???
Karel

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COL2
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This text is very long This text is very long This text is very long This text i
s very long This text is very long This text is very long This text is very long
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is very long This text is very long This text is very long This text is very lon
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