Once the module activated and created a Type, trying to save a complain shows:

Traceback (most recent call last):
  File "/trytond/wsgi.py", line 117, in dispatch_request
    return endpoint(request, **request.view_args)
  File "/trytond/protocols/dispatcher.py", line 47, in rpc
    return methods.get(request.rpc_method, _dispatch)(
  File "/trytond/wsgi.py", line 84, in auth_required
    return wrapped(*args, **kwargs)
  File "/trytond/protocols/wrappers.py", line 159, in wrapper
    return func(request, pool, *args, **kwargs)
  File "/trytond/protocols/dispatcher.py", line 181, in _dispatch
    result = rpc.result(meth(*c_args, **c_kwargs))
  File "/trytond/modules/sale_complaint/complaint.py", line 267, in create
    values['number'] = config.get_multivalue(
AttributeError: 'NoneType' object has no attribute 'get'

Fault: 'NoneType' object has no attribute 'get'