Mustang 2.0.1 was released on 2020-11-21 and contains important bugfixes, namely

• a corrected VAT calculation on prices with >2 decimals
• the guideline ID for XRechnung has been added (#172)
• corrected handling of input PDF/A-3 files
• corrected profile handling of fax-, tax-numbers

Additionally

• zero-rated goods are now supported
• as well as delivery period on item level and
• the specification of account (holder) names
• the Factur-X sample has been updated and a XRechnung sample is created in the tests