'Return safe defaults for names in case the model is disabled'

@staticmethod
def defaults():

    supply_item_id = S3ReusableField('item_id', 'integer', writable=False, readable=False)
    supply_item_category_id = S3ReusableField('item_category_id', 'integer', writable=False, readable=False)
    item_id = S3ReusableField('item_entity_id', 'integer', writable=False, readable=False)()
    item_pack_id = S3ReusableField('item_pack_id', 'integer', writable=False, readable=False)
    return dict(supply_item_id=supply_item_id, supply_item_category_id=supply_item_category_id, supply_item_entity_id=item_id, supply_item_pack_id=item_pack_id, supply_item_pack_quantity=(lambda tablename: (lambda row: 0)))
