# BR-DEX-15

Source: https://xmlvalid.com/rules/BR-DEX-15

> This CII file might use the concept of Sub Invoice Lines. However XRechnung does not support this.

- Level: warning
- Rule sets: XRechnung 3.0 rules (CII) 2.6.0
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:IncludedSupplyChainTradeLineItem/ram:AssociatedDocumentLineDocument[$isExtension]`
- Test: `not(exists(//ram:ParentLineID))`

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