Did you verify that you have selected the correct device (STM32F730) from the project options ? It could be possible that it is missing and you need to download a new patch for IAR to add it.
Another possibility is even if you selected a correct target device, maybe you didn't indicate a symbol to use as preprocessor.
To define a symbol, you need to go to IAR options, in the "C/C++ Compiler" category add the symbol (STM32F730xx in your case ) in the "preprocessor" tab.