# FX-SCH-A-000349

Source: https://xmlvalid.com/rules/FX-SCH-A-000349

> Only one BT-86 element is allowed on an invoice.

- Level: error
- Rule sets: Factur-X BASIC rules 1.09
- Context: `//ram:SpecifiedTradeSettlementPaymentMeans`
- Test: `(ram:PayeeSpecifiedCreditorFinancialInstitution or ram:PayerSpecifiedDebtorFinancialInstitution) or (not(ram:PayeeSpecifiedCreditorFinancialInstitution) and not(ram:PayerSpecifiedDebtorFinancialInstitution))`

Validate a document against these rules: https://xmlvalid.com/validate