The variable associated with model it turns undefined

[alienriquebm]

Hi my friend, first of all thanks for your excellent work with this plugin. I try to use it on this example:

1. I want that the user picks a car models from a list when fill a new vehicle information, so i put this for this:

   <select name="modeloMod" selector model="vehiculosc.newItem.modeloMod" options="vehiculosc.modelos" label-attr="modNombre" require="true" placeholder="--Seleccione Modelo--" group-attr="marcaMar.marNombre"></select>

   Well.. this works like a charm... but...

2. When i try to EDIT the data of a particular vehicle with this another HTML code (on another HTML form):

   <select name="modeloMod" selector model="vehiculosc.selectedItem.modeloMod"  options="vehiculosc.modelos" label-attr="modNombre" require="true" placeholder="--Seleccione Modelo--" group-attr="marcaMar.marNombre"></select>

The vehiculosc.selectedItem.modeloMod turns strangely UNDEFINED!! Im shure that this have a value (i used before a normal select and works peferctly)...

The structure of the vehiculosc.selectedItem.modeloMod is an array of object something like this:

"modeloMod": {
    "modId": 7,
    "modNombre": "CIVIC",
    "modObservacion": "",
    "marcaMar": {
      "marId": 97,
      "marNombre": "HONDA"
    }
}

Im using the config suggested on the page titled "Return entire object(s)"

On my page the dropdown shows the placeholder because the model is now undefined

So... can you help me? I am doing something wrong?
Thanks!