Does the invoice explain why this billed party is the proper party of interest and liable?

Sequence no
6
Slug
proper-party-basis
Question
Does the invoice explain why this billed party is the proper party of interest and liable?
Required element
Basis for billed-party status and liability.
Provision slug
cfr-541-6-a
Consequence if missing
Missing required information removes the billed party’s obligation to pay the applicable charge under §541.5; §541.4 Reserved does not supply an automatic billable-party rule.

Source