While the Postal Service strives to provide ACS data in the manner described in this document, there may be occasions when the data field may not contain the expected data. When customers submit a COA, it is possible that some of the data provided may not be accurate or may be incomplete. In rare instances when our systems are unable to make corrections to the COA data submitted by the customer, the Postal Service has no choice but to include the data exactly as it was provided by the customer. Additionally, in other rare instances, it is possible that other data fields, not directly related to the data fields provided by the customer, may be missing. We strongly suggest that all automated systems utilizing ACS data perform validity checks on all fields.
