Change Variable Name in SCL Source

Dear Experts,

Happy New 2008 to you all !!

I´m working with a PCS7 project (v6.1 SP1) and i´ve got a question related to the creation of user-defined blocks.

First of all, i´ve created an SCL source just for testing with only input and output variables (no program at all). An input variable called "ENTRADA" and an output variable called "SALIDA". With this SCL structure, I create an FB 1300 and i move it to the project library. Afterwards, i create a test CFC and i drag-and-drop the FB into the chart. I compile the program (CFC) and OS and both tags are generated in the Tag Management of WinCC (.ENTRADA and .SALIDA).

By the way, i set the attribute S7_m_c:=true

So far, everything OK. But after this was properly done, i´ve decided to change the NAME of either the Input or the Output. For example, i try to rename the input as "ENTRADA2" in the SCL source. I compile the source again without errors. Then the modified FB 1300 is dragged-and-dropped again to the chart. It asks me for the update of the block and i accept. Finally, i compile the program (only changes) and compile the OS (only changes , also) but now it doesn´t create any tag.

I repeat the same action but this time compiling the entire OS and i get the following message (shown in the attached printscreen: "ErrorCompOS.bmp"). I also attach you the "Transfer.log" file in order to help to diagnose.

Finally, i performed a "Save as... with reorganization" (as shown in the following FAQ, http://support.automation.siemens.com/WW/view/en/22021727), but again i got the same error.

As i´m totally stuck right now, could you please assist me with this topic ? Is it possible to do this action ?

Thank you very much in advance for your support.

Best wishes !