IBR-003: A Self-billed invoice MUST have a Self-billed invoice issue date (ibt-002).
IBR-073: A date MUST be formatted YYYY-MM-DD in (ibt-002), (ibt-007), (ibt-009), (ibt-026), (ibt-072), (ibt-073), (ibt-074), (ibt-134), (ibt-135), (ibt-177), (ibt-181).