Call RFC with DLL created with DCOM CONNECTOR

I try to call a RFC with a DLL that i created with the SAP R/3 DCOM CONNECTOR (Release 4.5.B):
My external soft calls the DLL, which calls the RFC, which calls a transaction (Call Transaction Mode N, Update S)...
When i test the RFC in SAP (SE37), it's OK.
But when i call the RFC with my soft (and with the DLL), the Call Transaction returns sy-subrc = 1.001 (the methode "AdviseRfcGuiSink" included in the DLL allows me to launch the debugging with my external soft).
I found no SAP notes about this problem.
If you met the same problem, could you help me ?
Thanks.
Julien.

Some Years later I have the same Problem.
As discripet in the post before - first I've got an error in the Method "CreateNewRow()" where the Method wants to return "return new byte[]()". Well I don't know why the .Net-Connector creates that code - but it looks strange to me.
The origin Code is:
    /// <summary>
    /// Creates an empty new row of type byte[].
    /// </summary>
    /// <returns>The newbyte[].</returns>
       public override object CreateNewRow()
            return new byte[]();;
With Changing that method I've got the same Error as in the post before:
System exception thrown while marshaling RFCTYPE_XMLDATAto .NET type.
Does someone has found a solution for that kind of Problem?

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