Source: XPO Accessorial Rules Tariff | CNWY 199-AK.3 | Effective August 17, 2026 | Item 28 "Inadvertence Clause – Application of Classes (Exception of NMF 100, Item 170)" | PDF page 23.
What the clause actually decides
Item 28 is written for one set of facts: density or density group not shown, and the shipment accepted anyway. Both conditions appear in the same sentence, joined by “and”. The item then fixes the initial class at 150 and describes an adjustment path rather than a final determination.
Read that way, the class 150 entry on the invoice is not the end of the classification question. It is the rate that applies while the density information needed to rate the shipment was absent from the tender. The full text of Item 28, as quoted above, does not use the word penalty and does not describe a service failure; it describes an initial assessment and the evidence that changes it.
The clause does not address every classification dispute. A shipment whose stated density was accepted and later questioned is a different situation from a shipment accepted with no density shown, and Item 28 as quoted here speaks to the second one.
What satisfactory proof has to establish
The item names two alternatives: a higher actual density, or a lower class. Either one, satisfactorily proven, moves the rating off the initial class 150. The proof therefore has to be about the property that was missing from the tender, which in this clause is density or density group.
Item 28 does not list examples of acceptable documents. Item 29 of the same tariff, which deals with Class 0 commodities and a value threshold rather than density, does give examples of satisfactory proof. Those examples belong to Item 29's question and should not be carried across to Item 28 as though the two items shared a document list.
What you can control is the measurement record behind the proof. Dimensions, piece count, and weight that produce the density figure should be documented once and kept together, so the number you submit can be traced back to the shipment rather than reconstructed later. A freight density calculator is a reasonable way to check the arithmetic; it is not evidence that the shipment was measured.
The Item 205 charge sits alongside the correction
Both items end with the same tail: the shipment becomes subject to a charge pursuant to CNWY 199 Item 205, in addition to all other lawfully applicable charges. That sentence is what separates a class correction from a billing outcome. An adjusted class changes the rate basis; the Item 205 charge is a separate amount that the adjustment brings into play.
This page does not compute that amount, and the quoted text does not state it. When you ask about the correction, ask for the revised charge detail rather than only the revised class, so the two figures appear in the same response.
The parallel item is worth reading next to this one: how XPO rates a Class 0 commodity at Class 300 under Item 29. The two provisions share the Item 205 tail but answer different questions, one about a missing value and one about a missing density.
What this page does not establish
This page quotes Item 28 and explains what its wording covers. It does not restate Item 170 of the NMF 100 Series, which the item identifies as the provision it departs from, and it does not describe that item's terms.
It also does not determine your commodity's classification, calculate your shipment's density, decide whether a particular acceptance was inadvertent, state which documents XPO will treat as satisfactory proof, or supply an Item 205 charge amount. Those points should stay open in your notes until the applicable records and the carrier's response support them.
The practical next step is narrow: establish whether density or density group was shown on the tender, assemble the measurement record behind any density you intend to submit, and ask for the revised class and the related Item 205 charge in the same request.