Do not use One2Many with filter to get MultiValue records

The filter may prevent to find the right value.

Closes #12078

trytond/trytond/model/multivalue.py

@@ -22,7 +22,8 @@ class MultiValueMixin(object):
         Value = self.multivalue_model(field)
         for fname, field in self._fields.items():
             if (field._type == 'one2many'
-                    and field.model_name == Value.__name__):
+                    and field.model_name == Value.__name__
+                    and not field.filter):
                 return getattr(self, fname)
         return Value.search([])