code: def validate_sum(parameter_container, validation_message, **kwargs):
      
      parameters = parameter_container.get_parameters(False)
      values = []
      for parameter in parameters:
          if parameter.selected_option_type() in [SINGLE_DYNAMIC, STATIC]:
              values.append(parameter.value)
  
      sum_threshold = kwargs.get('max', 1)
  
      if None in values:
          # If there is None, just check to not exceeding validation_threshold
          clean_value = [x for x in values if x is not None]
          values.remove(None)
          if sum(clean_value) > sum_threshold:
              return {
                  'valid': False,
                  'message': validation_message
              }
      else:
          # Just make sure to not have more than validation_threshold.
          if sum(values) > sum_threshold:
              return {
                  'valid': False,
                  'message': validation_message
              }
      return {
          'valid': True,
          'message': ''
      }
docs: Validate the sum of parameter value's.
  
      :param parameter_container: The container that use this validator.
      :type parameter_container: ParameterContainer
  
      :param validation_message: The message if there is validation error.
      :type validation_message: str
  
      :param kwargs: Keywords Argument.
      :type kwargs: dict
  
      :returns: Dictionary of valid and message.
      :rtype: dict
  
      Note: The code is not the best I wrote, since there are two alternatives.
      1. If there is no None, the sum must be equal to 1
      2. If there is no None, the sum must be less than 1