# FX-SCH-A-000771

Source: https://xmlvalid.com/rules/FX-SCH-A-000771

> Element 'ram:URIID' must occur exactly 1 times.

- Level: error
- Rule sets: Factur-X EXTENDED rules 1.09.2
- Context: `/rsm:CrossIndustryInvoice/rsm:SupplyChainTradeTransaction/ram:ApplicableHeaderTradeAgreement/ram:SellerTaxRepresentativeTradeParty/ram:URIUniversalCommunication`
- Test: `count(ram:URIID)=1`

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