EHP is a document, that the Dutch tax office requests to declare your income which is not taxed in the Netherlands. This means, that you have to confirm that you had or had not income in other country (such as in your home country).
This document has to be completely filled out and signed by the tax office in your country of residence. The Dutch tax office does not accept it if there are blank sections. Also, the tax office only accepts the original document (no copies, no scan, no pictures) and it reject EHPs if you make any corrections in ink.
Have a look at our EHP sample which shows how the form needs to look like in order to be approved by the tax office in the Netherlands.
Only the sections 4 and 5 need to be filled out, signed and stamped by the tax office in your country of residence.
You can download the form on the official site of the Dutch Tax Authorities here.