Name: lot-code-request
Type: request
Purpose: >
  Requests an event lot code deposited for the sender of the message
Response: lot-code
Inherits: message
Elements:
  Signature: { required: true }
  From: { required: true }
  Event-Id: { type: identifier, class: event }
Rejection-Codes:
  41: Event does not exist
  42: No lot code deposited for sender
  43: Event status does not allow lot code requests