Save .raw case after updating the transformer limits in python

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Hello! I have a quick question to save .raw case in the python script.

I am implementing a python script for changing the voltage limits of the 2-winding transformer using this function from the PSSEv35 API: twowindingchng_6. The code is running without any error and I can see the voltage limit changes being made in the Logfile that is generated after the run. However, I am unable to see these changes in the .raw case file even if I reopen it in PSSE after the successful script run. If you can help me get around this issue or point to a helpful API function that would be great. Cheers!