DATA_UPLOAD_MAX_NUMBER_FIELDS exceeded when not conducting a mass event re ticket #26810

I have an Admin based application which is somewhat ambitious for the
Admin. Perhaps.  My central model (substance) has a lot of stuff to do
when it is saved. I received the error[1] when saving a substance. Not
all substances. In fact only one out of twenty or so I was testing.

I thought it must be data related because the substance wasn't different
than the others.

I could work around the problem by increasing the
DATA_UPLOAD_MAX_NUMBER_FIELDS to 1045

I have left it at 1500 for now but I'm somewhat concerned. Why is it so?
I don't think there are more than the default 1000 fields. I haven't
counted them though.

Thanks for any elucidation

Mike

[1]
Environment:

Request Method: POST
Request URL: http://localhost:8000/admin/substance/substance/80/change/

Django Version: 1.10.8
Python Version: 3.5.3
Installed Applications:
['django.contrib.auth',
 'django.contrib.contenttypes',
 'django.contrib.sessions',
 'django.contrib.sites',
 'django.contrib.messages',
 'django.contrib.admin',
 'django.contrib.admindocs',
 'django.contrib.staticfiles',
 'billing',
 'common',
 'company',
 'credit',
 'refer',
 'regulation',
 'substance',
 'workplace']
Installed Middleware:
['django.middleware.cache.UpdateCacheMiddleware',
 'django.contrib.sessions.middleware.SessionMiddleware',
 'django.middleware.locale.LocaleMiddleware',
 'django.middleware.common.CommonMiddleware',
 'django.middleware.csrf.CsrfViewMiddleware',
 'django.contrib.auth.middleware.AuthenticationMiddleware',
 'django.contrib.messages.middleware.MessageMiddleware',
 'django.contrib.admindocs.middleware.XViewMiddleware',
 'django.middleware.clickjacking.XFrameOptionsMiddleware',
 'django.middleware.cache.FetchFromCacheMiddleware']



Traceback:

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\core\handlers\exception.py"
in inner
  42.             response = get_response(request)

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\core\handlers\base.py"
in _legacy_get_response
  249.             response = self._get_response(request)

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\core\handlers\base.py"
in _get_response
  178.             response = middleware_method(request, callback,
callback_args, callback_kwargs)

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\middleware\csrf.py" in
process_view
  260.                     request_csrf_token =
request.POST.get('csrfmiddlewaretoken', '')

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\core\handlers\wsgi.py"
in _get_post
  128.             self._load_post_and_files()

File "C:\Users\mike\env\xxex3\lib\site-packages\django\http\request.py"
in _load_post_and_files
  299.                 self._post, self._files =
self.parse_file_upload(self.META, data)

File "C:\Users\mike\env\xxex3\lib\site-packages\django\http\request.py"
in parse_file_upload
  258.         return parser.parse()

File
"C:\Users\mike\env\xxex3\lib\site-packages\django\http\multipartparser.py"
in parse
  183.                             'The number of GET/POST parameters
exceeded '

Exception Type: TooManyFieldsSent at /admin/substance/substance/80/change/
Exception Value: The number of GET/POST parameters exceeded
settings.DATA_UPLOAD_MAX_NUMBER_FIELDS.

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