# W-LIB241

Source: https://xmlvalid.com/rules/W-LIB241

> PaymentMeans/ID should be used when more than one instance of the PaymentMeans class is present.

- Level: warning
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2, OIOUBL 2.1 Credit Note rules (Denmark) 1.17.2, OIOUBL 2.1 Reminder rules (Denmark) 1.17.2
- Test: `count(../cac:PaymentMeans) > 1 and not(cbc:ID != '')`

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