A <b>Leg Endpoint</b> MUST correspond to a <b>Transport Call</b> (in a <b>Carrier</b>'s system) when the <b>Mode Of Transport</b> is "VESSEL". This also allows the <b>Vessel</b>s associated with the <b>Leg</b> to be identified if necessary (unless there are more than two vessels involved, which is possible but unlikely).<br/><br/>For other <b>Modes of Transport</b>, a <b>Leg Endpoint</b> MAY correspond to a <b>Transport Call</b>. <br/>