issue_comments: 1240904315

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https://github.com/pydata/xarray/issues/6946#issuecomment-1240904315 https://api.github.com/repos/pydata/xarray/issues/6946 1240904315 IC_kwDOAMm_X85J9rJ7 20629530 2022-09-08T15:51:15Z 2022-09-08T15:51:27Z CONTRIBUTOR

I found another problem that this issue causes : the dataset can't be written to netCDF and the error message suggests exactly what has already been done: ```python import xarray as xr ds = xr.tutorial.open_dataset('air_temperature')

ds = ds.stack(spatial=['lon', 'lat']) ds = ds.reset_index('spatial', drop=True)

ds.to_netcdf('test.nc') raises: NotImplementedError: variable 'lat' is a MultiIndex, which cannot yet be serialized to netCDF files (https://github.com/pydata/xarray/issues/1077). Use reset_index() to convert MultiIndex levels into coordinate variables instead. ```

@benbovy I'm guessing your PR will fix this, but I'm raising the issue to be sure.

 
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