SICAM eRTU CFC command routing


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I'm using SICAM eRTU with CFC and 412 CPU.
want to route a command recieved from IEC 104 to IEC 103 IED connected via MCP. I'm able to handle the recieved command using COMM_OPEN block. the CRCOM block is used for generation of the new command.

my problem is how to tratransmit the new command to IEC 103 IED. I have tried both COMM_OPEN and COMM_SIC blocks without success.
In debug mode it seems that every thing is ok when using COMM_OPEN, but acctually there is no transmitted frame to the IED.
the CFC chart is running in OB1 free cycle task.
any help will be appreciated