String is encoded as UNKNOWN1 UTF-8, ISO 646, ASCII,ISO 8859, Shift-JIS, EUC, etc; only UTF-8 is permitted

Hi Guys,

We have an interface which is File(SFTP) to WS in PI 7.1 which is throwing below error in IE although we can see that target payload has been generated which means that it has passed the mapping but not sure why PI is throwing below error:

<SAP:Error SOAP:mustUnderstand="" xmlns:SAP="http://sap.com/xi/XI/Message/30" xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/">

  <SAP:Category>XIServer</SAP:Category>

  <SAP:Code area="INTERNAL">WRONG_ENCODING</SAP:Code>

  <SAP:P1>UNKNOWN</SAP:P1>

  <SAP:P2>UTF-8, ISO 646, ASCII,ISO 8859, Shift-JIS, EUC, etc</SAP:P2>

  <SAP:P3 />

  <SAP:P4 />

  <SAP:AdditionalText />

  <SAP:Stack>String is encoded as UNKNOWN1 UTF-8, ISO 646, ASCII,ISO 8859, Shift-JIS, EUC, etc; only UTF-8 is permitted</SAP:Stack>

  <SAP:Retry>M</SAP:Retry>

  </SAP:Error>

Kindly suggest to resolve this issue.

Thanks.

Regards,

Aki