Version 1.8.0 of Mustangserver was released 18 December 2025, and supported ZUGFeRD 2.4 as well as styledinvoices, a way to exert full visual control on created Factur-X invoices.
Today, February 6th, 2026, we already released the subsequent version 1.8.1, which ships with a calculate endpoint, enabling e.g. invoice creation forms to easily obtain live previews of taxes and total amounts for users.
Month: February 2026
2.22.0
On February 4th, 2026, we released the new version 2.22.0 of our open source e-invoicing toolkit “Mustangproject”, which added minor features and multiple fixes.
New features
- #1011 calculatedinvoice needs to contain VATtotal
- #1010 add DeliveryNoteReferencedDocument per Item
- #253/#994 add DeliveryNoteReferencedDocument for import and export
- #536 support BT-18
- #1000 Support ItemSellerTradeParty at line level (Factur-X / ZUGFeRD EXTENDED) for French municipalities subcontracting services to other municipalities
Fixes
- #990 Fix empty ValidationResult when XMP metadata contains invalid XML characters
- #859 SpecifiedTradePaymentTerms twice since version 2.16.5
- #992 fix typo
- #999 Write RateApplicablePercent on head also for tax free
- #997 CategoryCode O Need VAT rate in header breakdown (BT-119) but MUST omit line VAT rate (BT-152)
- #1003 IncludedNote SubjectCode PMD AAB
- #998 ZUGFeRDInvoiceImporter does not properly handle UBL CreditNote documents
- #1006 Duplicate Notes and Missing BIC Parsing in ZUGFeRDInvoiceImporter
- #1017 Concurrency problems in ZUGFeRDDateFormat
- deprecate itemTotalAllowances instead of itemAllowances over itemCharges
- corrected import of UBL rounding amount
As usual, Mustangproject can be embedded in Java software using Maven Central, or downloaded as windows/linux/mac command line tool for free from it’s homepage.