One of the mysteries of the English language finally explained.
Definition of post entry in English:
post entry
noun
1Bookkeeping. An extra or additional entry; a late entry; specifically an additional or supplemental entry in the manifest of a vessel, of an item or items of dutiable merchandise omitted at the time of the entry of the vessel at the custom house (now historical).
2A subsequent or late entry, especially to a competition.
Origin
Mid 17th century; earliest use found in Order House of Commons as to Customs. From post- + entry.