I don't have an exact answer for this, but would suggest that you look at the underlying XML in the .twb file and identify what you may need to pass specifically. If you have packaged your workbook and have the extension .twbx, just use any extracting tool, like WinZip, and you can get the .twb file.
Your comment gave me the tools to figure it out this problem .
If you wanna know what i did, let me know
I would state that you mention it here for the benefit of all.
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I looked the internal name of the datsource in the TSD file. For the calculated fields i had to looked also the specific internal name of them.
in other words