Support for writable ManyToManyField's

[cript0nauta]

Hii, I'm using ROA as a client of a Django Rest Framework API. I defined in both sides a basic many to many field. In DRF i can read and write this via json as a list ok primary keys.
In ROA i can read this field correctly but for writing I can't: The clear() method doesn't work and add() throws thid error:
Cannot add "<Model: XXXX>": instance is on database "None", value is on database "default"
It seems that this happens because it reads the model on the local database and not via the API.
Some useful information:

>>> model = Model.objects.first()
>>> model.m2m_field
<django.db.models.fields.related.ManyRelatedManager at 0x7f2323f6a810>
>>> model.m2m_field.is_roa_manager
True

How can I solve this?