# ISDOC-4.1.9

Source: https://xmlvalid.com/rules/ISDOC-4.1.9

> Nepovinnou položku TertiarySellersItemIdentification lze uvést pouze v případě, že jsou uvedeny také položky SellersItemIdentification a SecondarySellersItemIdentification.

- Level: error
- Rule sets: ISDOC 6.0.2 rules
- Context: `isdoc:Invoice/isdoc:InvoiceLines/isdoc:InvoiceLine/isdoc:Item[isdoc:TertiarySellersItemIdentification]`
- Test: `isdoc:SellersItemIdentification and isdoc:SecondarySellersItemIdentification`

In English: TertiarySellersItemIdentification may be given only together with SellersItemIdentification and SecondarySellersItemIdentification.

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