# HAP1650-5f

Source: https://xmlvalid.com/rules/HAP1650-5f

> The assignee's tax number (FactoringAssignmentData/Assignee) is the seller's (…); they must differ.

- Level: error
- Rule sets: Facturae validation rules of the Spanish public sector Orden HAP/1650/2015, Facturae 3.2.x description of 6 June 2017
- Context: `/*:Facturae`
- Test: `not($assignee) or upper-case(normalize-space($assignee)) != upper-case($seller)`

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