IDOC from DataHub to SAP: encoding UTF-8 is missing.

Hi,

we use hybris with datahub and a SAP system in China. Our orders are rejected because of error "409input_not_correct" in datahub log. Debugging SAP shows the error: "encoding UTF-8 is missing". The datahub uses UTF-8 because of wrapper.java.additional.11=-Dfile.encoding=UTF-8. We don't find something in datahub administrator to configure anthing with encoding. Does anyone has a similar problem or an idea how to solve? Thank's a lot.

Harry