EH&S WWI for GLM print request processing

Hi all,

we installed EH&S WWI for GLM print request processing scenario, following the note:"1394553", but when we try to print we receive this error from WWI:

Start Function 'WWI_PRINTREQUEST_CREATE'

  Initializing parameters

  Receiving data from client

   calling RfcGetData returned 0

    receiving data lasted: 0.0 sec.

    Retrieving print request data from RFC interface

    Using Temp Directory E:\WWI\TEMP\BSV100000000000062

   Delete files in E:\WWI\TEMP\BSV100000000000062

    Creating text file E:\WWI\TEMP\BSV100000000000062\r000000000062.val

    Writing data to text file 39 lines, 1009 characters

    Updating print request status from 0 to 1

    [DB time] Writing print request lasted 9 ms

  Start processing command 'Create print request' in synchronous mode

  Creating print request 000000000062

WwiSapDms::retrieveDocument: RFC error when calling ABAP function moduleRFC connection is not Unicode

WwiSapDms::retrieveDocument: RFC error when calling ABAP function module

key     : RFC_ERROR_SYSTEM_FAILURE

message : See RFC trace file or SAP system log for more details

Reading SBV document IB0120510 from Cache failed

    WwiCacheRead resulted with -1

    Updating print request status from 1 to 5

    [DB time] Writing print request lasted 4 ms

  ##### Command 'Create print request' finished with status E #####

    Storing ERR file E:\WWI\TEMP\BSV100000000000062\l000000000062.err into DMS succeeded

    22 lines

  Sending data to client

   calling RfcSendData returned 0

    sending data lasted: 0.0 sec.

Elapsed time : 0.1 sec.

We don't understand what kind of RFC or what part of customizing we have to check, could you please help us?

Thanks,

Christian