# AF-0048

Source: https://xmlvalid.com/rules/AF-0048

> Es wurde kein Wert angegeben. Es wurde keine E-Mail-Adresse angegeben.

- Level: error
- Rule sets: e-Rechnung.gv.at checks (UBL) Fehlerliste, October 2026
- Context: `/ubl:Invoice | /cn:CreditNote`
- Test: `normalize-space($supplier/cac:Party/cac:Contact/cbc:ElectronicMail) != ''`

In English: No e-mail address was given for the seller; e-Rechnung.gv.at sends its messages about the invoice there.

## How to fix it

- UBL: add `cac:Contact/cbc:ElectronicMail` to the seller (BT-43).

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