EN 16931 rules as ZATCA ships them (UBL)

103 rules, version SDK 3.4.6, published by ZATCA (Zakat, Tax and Customs Authority), from the CEN/TC 434 rules (GNU LGPL 3.0, source). Checked with Saudi Arabia ZATCA Tax Invoice (UBL), Saudi Arabia ZATCA Simplified Tax Invoice (UBL) .