# NFE-503

Source: https://xmlvalid.com/rules/NFE-503

> Rejeição: CNPJ do emitente com Série incompatível (série …).

- Level: error
- Rule sets: SEFAZ authorisation rules of NF-e 4.00 MOC 7.0 Anexo I, NTs up to 2026.010
- Context: `nfe:infNFe`
- Test: `not($emit/nfe:CNPJ) or $serie le 909`

In English: An issuer with a CNPJ must use a series from 0 to 909.

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