code: func (s *StandardChannel) ProcessNormalMsg(env *cb.Envelope) (configSeq uint64, err error) {
  	configSeq = s.support.Sequence()
  	err = s.filters.Apply(env)
  	return
  }
docs: // ProcessNormalMsg will check the validity of a message based on the current configuration.  It returns the current
  // configuration sequence number and nil on success, or an error if the message is not valid