sourceKind property
SourceKind is what caused the posting: a bank line, a scanned document, a commerce sale. With sourceId it traces the entry back to the thing that produced it.
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? sourceKind;