Error 403 in POST to MASTERDATA

I am trying to create a form to this acount, this is my code and the error i get. I got the Master Data Aplication and Data Entitie with the same fields that the form, all them public to write and with exactly the same names as required, as long you can see, the form collect the inputs values with no problems, but when the ajax call is executed it´s fails with a 403 Error, like it´s don´t have permision to post the data, but when I click on the link of error i got this code:

<Error>

<script id="tinyhippos-injected"/>

<Message>

The requested resource does not support http method 'GET'.

</Message>

</Error>

Please Help

403libro_ajaxlibro_getdataoklibro_funciones

na aba network você consegue ver qual o campo está dando erro 403. Depois você abre o masterdata no DS e salva o campo como Public.