3.48.2 When seeking to implement a national Advance Passenger Information (API) programme, Contracting States that are unable to comply fully with the provisions contained in 3.48.1 with respect to data element requirements shall ensure that only those data elements that have been defined for incorporation into the UN/EDIFACT PAXLST message are included in the national programme’s requirement or follow the WCO’s Data Maintenance Request (DMR) process for any deviation from the standard.