# BR-66

Source: https://xmlvalid.com/rules/BR-66

> An Invoice shall contain maximum one Payment Card account (BG-18).

- Level: error
- Rule sets: Romanian RO e-Factura rules (UBL) 1.0.9
- Context: `/ubl:Invoice | /cn:CreditNote`
- Test: `count(cac:PaymentMeans/cac:CardAccount) <= 1`

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