Тъйкато вероятно това заявление е формуляр, смятам, че declaration form ще свърши работа. Всъщност и само declaration ще свърши работа, предвид че декларация означава заявление.

От контекста не се разбира за какъв точно документ става дума. По принцип би могло и просто Declaration

Предполагам, че става дума за нещо от сорта:

https://www.ups.com/us/en/help-center/sri/declaration-statem...

What is a Declaration Statement?

A Declaration Statement is required for all outgoing international shipments. It is a legal certification you provide to Customs affirming that the information on your international forms, regarding your shipment, is true and accurate.
In its simplest form, a declaration statement might read: "I hereby certify that the information on this invoice is true and correct and the contents and value of this shipment are as stated."
For shipments governed by the North American Free Trade Agreement (NAFTA), a statement might read: "I hereby certify that the good covered by this shipment qualifies as an originating good for purposes of preferential tariff treatment under the NAFTA."
Your declaration statement can be up to 550 characters in length, and you can save up to 10 customized statements for repeated use.

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Note added at 12 mins (2018-10-22 14:48:44 GMT)
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Освен това, вижте тук:
https://stackoverflow.com/questions/46351924/javascript-decl...
•A statement on the other hand is is a standalone unit of execution. It does not return anything.
•A declaration is a statement in which a value is assigned to a variable.
•All declarations are statements, but not all statements are declarations.

Ако поясните за какъв вид документ става въпрос, бих могла да подам по-точен отговор.