fatalEN 16931syntax binding ruleUBLBG-18
An Invoice shall contain maximum one Payment Card account (BG-18).
More than one payment card group (BG-18).
Keep a single card account. An invoice states one way to pay.
UBL — context /ubl:Invoice | /cn:CreditNote
count(cac:PaymentMeans/cac:CardAccount) <= 1