Validation crash after converting account file from csv to parquet

[sambles]

Steps to Reproduce (Bugs only)

1. $ git clone [email protected]:OasisLMF/OasisAzureModels.git
2. $ cd OasisAzureModels/test_data
3. $ ods_tools check --account PF1_acc.csv --location PF1_loc_CAFL.csv (passes validation)
4. $ ods_tools convert --account PF1_acc.csv -c parquet --output-dir . (works) creating a new file PF1_acc.parquet
5. $ ods_tools check --account PF1_acc.parquet --location PF1_loc_CAFL.csv (fails with trace below)

Version / Environment information

ods_tools==3.1.0

Example data / logs

$ ods_tools check --account PF1_acc.parquet --location PF1_loc_CAFL.csv
Traceback (most recent call last):
  File "/home/sam/repos/venv/3py/bin/ods_tools", line 8, in <module>
    sys.exit(main())
             ^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/main.py", line 135, in main
    command_action[kwargs.pop('command')](** kwargs)
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/main.py", line 49, in check
    oed_exposure.check()
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/exposure.py", line 230, in check
    validator = Validator(self)
                ^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/validator.py", line 28, in __init__
    self.column_to_field_maps[oed_source] = oed_source.get_column_to_field()
                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/source.py", line 390, in get_column_to_field
    self.dataframe.columns,
    ^^^^^^^^^^^^^^
  File "/usr/lib/python3.11/functools.py", line 1001, in __get__
    val = self.func(instance)
          ^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/source.py", line 360, in dataframe
    df = self.load_dataframe()
         ^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/source.py", line 416, in load_dataframe
    oed_df = self.as_oed_type(oed_df, column_to_field)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/ods_tools/oed/source.py", line 314, in as_oed_type
    oed_df.loc[oed_df[column].isin(BLANK_VALUES), column] = ''
    ~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/indexing.py", line 849, in __setitem__
    iloc._setitem_with_indexer(indexer, value, self.name)
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/indexing.py", line 1835, in _setitem_with_indexer
    self._setitem_with_indexer_split_path(indexer, value, name)
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/indexing.py", line 1928, in _setitem_with_indexer_split_path
    self._setitem_single_column(loc, value, pi)
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/indexing.py", line 2034, in _setitem_single_column
    self.obj._mgr.column_setitem(loc, plane_indexer, value)
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/internals/managers.py", line 1384, in column_setitem
    new_mgr = col_mgr.setitem((idx,), value)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/internals/managers.py", line 394, in setitem
    return self.apply("setitem", indexer=indexer, value=value)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/internals/managers.py", line 352, in apply
    applied = getattr(b, f)(**kwargs)
              ^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/internals/blocks.py", line 1622, in setitem
    values[indexer] = value
    ~~~~~~^^^^^^^^^
  File "/home/sam/repos/venv/3py/lib/python3.11/site-packages/pandas/core/arrays/_mixins.py", line 250, in __setitem__
    self._ndarray[key] = value
    ~~~~~~~~~~~~~^^^^^
ValueError: assignment destination is read-only

File seems to load ok (outside of ods_tools)

In [1]: import pandas as pd
In [2]: PF1_acc = pd.read_parquet('PF1_acc.parquet')
In [3]: PF1_acc
Out[3]:
      PortNumber AccNumber AccCurrency  AccMaxDed5PD  ... PolPerilsCovered PolLimit6All PolLimitType6All  PolPeril
0      Portfolio     2-999         USD           0.0  ...              WEC  34163.04673                0       WEC
1      Portfolio     2-998         USD           0.0  ...              WEC  34163.04673                0       WEC
2      Portfolio     2-997         USD           0.0  ...              WEC  13665.21870                0       WEC
3      Portfolio     2-996         USD           0.0  ...              WEC  13665.21870                0       WEC
4      Portfolio     2-995         USD           0.0  ...              WEC  68326.09347                0       WEC
...          ...       ...         ...           ...  ...              ...          ...              ...       ...
88137  Portfolio       732         USD           0.0  ...              WEC  33791.29932                0       WEC
88138  Portfolio       398         USD           0.0  ...              WEC  34163.04673                0       WEC
88139  Portfolio       367         USD           0.0  ...              WEC  33791.29932                0       WEC
88140  Portfolio        32         USD           0.0  ...              WEC  34163.04673                0       WEC
88141  Portfolio         1         USD           0.0  ...              WEC  33791.29932                0       WEC

[88142 rows x 10 columns]