class posible_value(ModelSQL, ModelView):
      name = xxxx

class template((ModelSQL, ModelView):
    valid_value_ids = fields.Many2Many('template-posible_value' ....)

class object_that_uses_template(ModelWorkflow, ModelSQL, ModelView):
    #posible values
    valid_value_ids = fields.Function(fields.Many2Many(), 'get_valid_ids_from_template')
    #actual_values
    actual_value = fields.One2Many('actual_value', 'line_id', 'Ql.Value',)

class actual_value(ModelSQL, ModelView):
    value = fields.Many2One('posible.value', 'Wert', 'Ql.Value',
                            domain=[('id', 'in', ONLY_THE_ONES_USED_in_the_object_that_uses_template)])