knockout.js - Knockout mapping.fromJS does not map all properties -

i'm trying mapping viewmodel every time call ajax function mapping.fromjs not mapping properties of object.

i thought maybe problem property not declared, found solution here, i'm creating empty viewmodel templating server using viewbag.

here happening:

the data object has property "entregapai" id , viewmodel has value undefined, , after mapping:

the "entregapai" property still undefined rather others mapped well.

[edit]

here code:

 // seleção de linha da lista - ajustar dados          self.selectrow = function (row, event) {                self.canrefreshsubtipopais = false;                $.ajax({                  url: template.urlget,                  method: 'get',                  contenttype: "application/json; charset=utf-8",                  data: { entregaid: row.entregaid() },                  cache: false,                  success: function (data) {                                                                                         ko.mapping.fromjs(data,self.formdata);                                            //change status of form, not relevant                      pbccadastrosframework.configuraestado("s", self);                      $(event.target.parentelement).addclass('success').siblings().removeclass('success');                                                                                     }              });          };

i use ko.mapping plugin lot of other forms in project in 1 problem occurs.