against property
Against names the OTHER accounts in the same voucher — the contra side of this leg — so a single row reads as an entry rather than as half of one.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? against;