core + attic (Attic Area): these terms have been either depricated from the core or extentions, or removed from pending as not accepted into the full vocabulary.

partOfInvoice

Canonical URL: http://schema.org/partOfInvoice

Thing > Property > partOfInvoice

The order is being paid as part of the referenced Invoice.

Usage: Fewer than 10 domains
Values expected to be one of these types
Invoice
Used on these types
Order

Schema Version 3.2