# BR-DE-27

Source: https://xmlvalid.com/rules/BR-DE-27

> In BT-42 sollen mindestens drei Ziffern enthalten sein.

- Level: warning
- Rule sets: XRechnung 3.0 rules (UBL) 2.6.0
- Context: `/ubl:Invoice/cac:AccountingSupplierParty/cac:Party/cac:Contact | /cn:CreditNote/cac:AccountingSupplierParty/cac:Party/cac:Contact`
- Test: `matches(normalize-space(cbc:Telephone), $XR-TELEPHONE-REGEX)`

> In BT-42 sollen mindestens drei Ziffern enthalten sein.

- Level: warning
- Rule sets: XRechnung 3.0 rules (CII) 2.6.0
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTradeParty/ram:DefinedTradeContact`
- Test: `matches(normalize-space(ram:TelephoneUniversalCommunication/ram:CompleteNumber), $XR-TELEPHONE-REGEX)`

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