Mustangproject 2.24.0, released today, June 12th 2026, now supports Factur-X 1.09 / ZUGFeRD 2.5.0.
Additionally, the following has been fixed
- #1143 LineID may not be written empty in DeliveryNoteReferencedDocument
- #1141 ZUGFeRD 2.5/Factur-X 1.09
- #1127’Fix possible StringIndexOutOfBoundsException when extracting XMP.’
- #1133 incorrect warning in Subinvoiceline calculation
- Add Tax ExemptionReasonCode on document level.
Mustangproject is a cross platform, open source e-invoicing library and tool. It can validate, read, write and convert ZUGFeRD/Factur-X, CII, UBL, and XRechnung.