# F-INV311

Source: https://xmlvalid.com/rules/F-INV311

> Invalid Item Property Group ID in InvoiceLine. Must contain a value

- Level: error
- Rule sets: OIOUBL 2.1 Invoice rules (Denmark) 1.17.2
- Context: `doc:Invoice/cac:InvoiceLine/cac:Item/cac:ItemInstance/cac:AdditionalItemProperty/cac:ItemPropertyGroup`
- Test: `normalize-space(cbc:ID) != ''`

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