# CII-SR-469

Source: https://xmlvalid.com/rules/CII-SR-469

> Payment reference (BT-83) shall occur at most once in the document.

- Level: error
- Rule sets: EN 16931 rules (CII) 1.3.17, EN 16931 rules 1.3.16 (CII), EXTENDED-CTC-FR rules (CII) 1.4.0.04, Factur-X BASIC WL rules 1.09, Factur-X EN 16931 rules 1.09.2, Factur-X EXTENDED rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice`
- Test: `count(//ram:ApplicableHeaderTradeSettlement/ram:PaymentReference) <= 1`

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