diff --git a/facho/model/fields/field.py b/facho/model/fields/field.py
index e9c09ec..6d8e523 100644
--- a/facho/model/fields/field.py
+++ b/facho/model/fields/field.py
@@ -25,3 +25,17 @@ class Field:
 
         if callable(call):
             return call(*args)
+
+    def _create_model(self, inst, name=None, model=None):
+        try:
+            return inst._fields[self.name]
+        except KeyError:
+            if model is not None:
+                obj = model()
+            else:
+                obj = self.model()
+            if name is not None:
+                obj.__name__ = name
+            self._set_namespace(obj, self.namespace, inst.__namespace__)
+            inst._fields[self.name] = obj
+            return obj
diff --git a/facho/model/fields/many2one.py b/facho/model/fields/many2one.py
index 4b5caaa..1f6670c 100644
--- a/facho/model/fields/many2one.py
+++ b/facho/model/fields/many2one.py
@@ -13,15 +13,11 @@ class Many2One(Field):
         if inst is None:
             return self
         assert self.name is not None
-        return inst._fields[self.name]
+        return self._create_model(inst)
         
     def __set__(self, inst, value):
         assert self.name is not None
-        class_model = self.model
-        inst_model = class_model()
-
-        self._set_namespace(inst_model, self.namespace,  inst.__namespace__)
-        inst._fields[self.name] = inst_model
+        inst_model = self._create_model(inst, model=self.model)
 
         # si hay setter manual se ejecuta
         # de lo contrario se asigna como texto del elemento
diff --git a/facho/model/fields/model.py b/facho/model/fields/model.py
index 9653f5a..7ae217a 100644
--- a/facho/model/fields/model.py
+++ b/facho/model/fields/model.py
@@ -10,20 +10,8 @@ class Model(Field):
         if inst is None:
             return self
         assert self.name is not None
-        return self._create_model(inst)
+        return self._create_model(inst, name=self.field_name)
 
     def __set__(self, inst, value):
-        obj = self._create_model(inst)
-        obj._set_content(value)
-
-    def _create_model(self, inst):
-        try:
-            return inst._fields[self.name]
-        except KeyError:
-            obj = self.model()
-            if self.field_name is not None:
-                obj.__name__ = self.field_name
-            self._set_namespace(obj, self.namespace, inst.__namespace__)
-            inst._fields[self.name] = obj
-            return obj
-            
+        obj = self._create_model(inst, name=self.field_name)
+        obj._set_content(value)            
diff --git a/tests/test_model.py b/tests/test_model.py
index 4b1011b..fb2a30c 100644
--- a/tests/test_model.py
+++ b/tests/test_model.py
@@ -80,6 +80,22 @@ def test_many2one_with_custom_setter():
     party.location = 99
     assert '<Party><PhysicalLocation ID="99"/></Party>' == party.to_xml()
 
+def test_many2one_auto_create():
+    class TaxAmount(facho.model.Model):
+        __name__ = 'TaxAmount'
+
+        currencyID = fields.Attribute('currencyID')
+        
+    class TaxTotal(facho.model.Model):
+        __name__ = 'TaxTotal'
+
+        amount = fields.Many2One(TaxAmount)
+
+    tax_total = TaxTotal()
+    tax_total.amount.currencyID = 'COP'
+    tax_total.amount = 3333
+    assert '<TaxTotal><TaxAmount currencyID="COP">3333</TaxAmount></TaxTotal>' == tax_total.to_xml()
+
 def test_field_model():
     class ID(facho.model.Model):
         __name__ = 'ID'