# BR-RO-L156

Source: https://xmlvalid.com/rules/BR-RO-L156

> Numarul maxim permis de caractere pentru Referinta la o factura anterioara (BT-25) este 200. #The allowed maximum number of characters for the Preceding Invoice number (BT-25) is 200.

- Level: error
- Rule sets: Romanian RO e-Factura rules (UBL) 1.0.9
- Context: `//cac:BillingReference`
- Test: `string-length(normalize-space(cac:InvoiceDocumentReference/cbc:ID)) <= 200`

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