It is difficult to suggest a solution without seeing the data. I'm guessing from the message that the TDX file has more than one \ie. There should only be one \ie in the file.
The warnings with the \ili and \il2 simply mean that you will need to add styles for those markers. I don't see these styles listed in the GPS templates.
If the TDX file is set all as introduction styles I'd recommend removing the "i" from the markers and setting with with normal \li and \li2 styles. You can reduce the font for that book if you want the text smaller than normal.