BR-03

Issue date missing

What does this error mean?

The issue date (BT-2) is mandatory.

UBL: <cbc:IssueDate> as YYYY-MM-DD. CII: udt:DateTimeString with format="102" (YYYYMMDD).

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Rule source: EN 16931 / XRechnung (KOSIT) or Billhorse check (BH-*).