diff --git a/cl_sii/dte/data_models.py b/cl_sii/dte/data_models.py
index be44f07a..b93c0775 100644
--- a/cl_sii/dte/data_models.py
+++ b/cl_sii/dte/data_models.py
@@ -347,12 +347,12 @@ class DteDataL2(DteDataL1):
     # fields
     ###########################################################################
 
-    emisor_razon_social: str = dc_field()
+    emisor_razon_social: Optional[str] = dc_field()
     """
     "Razón social" (legal name) of the "emisor" of the DTE.
     """
 
-    receptor_razon_social: str = dc_field()
+    receptor_razon_social: Optional[str] = dc_field()
     """
     "Razón social" (legal name) of the "receptor" of the DTE.
     """
@@ -405,13 +405,15 @@ def __post_init__(self) -> None:
         """
         super().__post_init__()
 
-        if not isinstance(self.emisor_razon_social, str):
-            raise TypeError("Inappropriate type of 'emisor_razon_social'.")
-        validate_contribuyente_razon_social(self.emisor_razon_social)
+        if self.emisor_razon_social is not None:
+            if not isinstance(self.emisor_razon_social, str):
+                raise TypeError("Inappropriate type of 'emisor_razon_social'.")
+            validate_contribuyente_razon_social(self.emisor_razon_social)
 
-        if not isinstance(self.receptor_razon_social, str):
-            raise TypeError("Inappropriate type of 'receptor_razon_social'.")
-        validate_contribuyente_razon_social(self.receptor_razon_social)
+        if self.receptor_razon_social is not None:
+            if not isinstance(self.receptor_razon_social, str):
+                raise TypeError("Inappropriate type of 'receptor_razon_social'.")
+            validate_contribuyente_razon_social(self.receptor_razon_social)
 
         if self.fecha_vencimiento_date is not None:
             if not isinstance(self.fecha_vencimiento_date, date):
diff --git a/cl_sii/rcv/data_models.py b/cl_sii/rcv/data_models.py
index 3bf416d4..4c68fc2c 100644
--- a/cl_sii/rcv/data_models.py
+++ b/cl_sii/rcv/data_models.py
@@ -224,7 +224,7 @@ class RvDetalleEntry(RcvDetalleEntry):
     RCV_KIND = RcvKind.VENTAS
     RC_ESTADO_CONTABLE = None
 
-    emisor_razon_social: str = dc_field()
+    emisor_razon_social: Optional[str] = dc_field()
     """
     "Razón social" (legal name) of the "emisor" of the "documento".
     """
@@ -244,9 +244,10 @@ class RvDetalleEntry(RcvDetalleEntry):
     def __post_init__(self) -> None:
         super().__post_init__()
 
-        if not isinstance(self.emisor_razon_social, str):
-            raise TypeError("Inappropriate type of 'emisor_razon_social'.")
-        cl_sii.dte.data_models.validate_contribuyente_razon_social(self.emisor_razon_social)
+        if self.emisor_razon_social is not None:
+            if not isinstance(self.emisor_razon_social, str):
+                raise TypeError("Inappropriate type of 'emisor_razon_social'.")
+            cl_sii.dte.data_models.validate_contribuyente_razon_social(self.emisor_razon_social)
 
         if not isinstance(self.receptor_razon_social, str):
             raise TypeError("Inappropriate type of 'receptor_razon_social'.")
@@ -280,7 +281,7 @@ class RcRegistroDetalleEntry(RcvDetalleEntry):
 
     # TODO: docstring
     # TODO: can it be None? What happens for those "tipo docto" that do not have a receptor?
-    receptor_razon_social: str = dc_field()
+    receptor_razon_social: Optional[str] = dc_field()
 
     # TODO: docstring
     # note: must be timezone-aware.
@@ -293,9 +294,10 @@ def __post_init__(self) -> None:
             raise TypeError("Inappropriate type of 'emisor_razon_social'.")
         cl_sii.dte.data_models.validate_contribuyente_razon_social(self.emisor_razon_social)
 
-        if not isinstance(self.receptor_razon_social, str):
-            raise TypeError("Inappropriate type of 'receptor_razon_social'.")
-        cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
+        if self.receptor_razon_social is not None:
+            if not isinstance(self.receptor_razon_social, str):
+                raise TypeError("Inappropriate type of 'receptor_razon_social'.")
+            cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
 
         if self.fecha_acuse_dt is not None:
             if not isinstance(self.fecha_acuse_dt, datetime):
@@ -331,7 +333,7 @@ class RcReclamadoDetalleEntry(RcvDetalleEntry):
 
     # TODO: docstring
     # TODO: can it be None? What happens for those "tipo docto" that do not have a receptor?
-    receptor_razon_social: str = dc_field()
+    receptor_razon_social: Optional[str] = dc_field()
 
     # TODO: docstring
     # note: must be timezone-aware.
@@ -344,9 +346,10 @@ def __post_init__(self) -> None:
             raise TypeError("Inappropriate type of 'emisor_razon_social'.")
         cl_sii.dte.data_models.validate_contribuyente_razon_social(self.emisor_razon_social)
 
-        if not isinstance(self.receptor_razon_social, str):
-            raise TypeError("Inappropriate type of 'receptor_razon_social'.")
-        cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
+        if self.receptor_razon_social is not None:
+            if not isinstance(self.receptor_razon_social, str):
+                raise TypeError("Inappropriate type of 'receptor_razon_social'.")
+            cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
 
         if self.fecha_reclamo_dt is not None:
             if not isinstance(self.fecha_reclamo_dt, datetime):
@@ -371,7 +374,7 @@ class RcPendienteDetalleEntry(RcvDetalleEntry):
 
     # TODO: docstring
     # TODO: can it be None? What happens for those "tipo docto" that do not have a receptor?
-    receptor_razon_social: str = dc_field()
+    receptor_razon_social: Optional[str] = dc_field()
 
     def __post_init__(self) -> None:
         super().__post_init__()
@@ -380,6 +383,7 @@ def __post_init__(self) -> None:
             raise TypeError("Inappropriate type of 'emisor_razon_social'.")
         cl_sii.dte.data_models.validate_contribuyente_razon_social(self.emisor_razon_social)
 
-        if not isinstance(self.receptor_razon_social, str):
-            raise TypeError("Inappropriate type of 'receptor_razon_social'.")
-        cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
+        if self.receptor_razon_social is not None:
+            if not isinstance(self.receptor_razon_social, str):
+                raise TypeError("Inappropriate type of 'receptor_razon_social'.")
+            cl_sii.dte.data_models.validate_contribuyente_razon_social(self.receptor_razon_social)
diff --git a/tests/test_dte_data_models.py b/tests/test_dte_data_models.py
index 2af47153..c79702bd 100644
--- a/tests/test_dte_data_models.py
+++ b/tests/test_dte_data_models.py
@@ -238,19 +238,12 @@ def test_init_fail_razon_social_empty(self) -> None:
             )
         self.assertEqual(cm.exception.args, ("Value must not be empty.", ))
 
-    def test_init_fail_razon_social_none(self) -> None:
-        with self.assertRaises(TypeError) as cm:
-            dataclasses.replace(
-                self.dte_l2_1,
-                emisor_razon_social=None,
-            )
-        self.assertEqual(cm.exception.args, ("Inappropriate type of 'emisor_razon_social'.", ))
-        with self.assertRaises(TypeError) as cm:
-            dataclasses.replace(
-                self.dte_l2_1,
-                receptor_razon_social=None,
-            )
-        self.assertEqual(cm.exception.args, ("Inappropriate type of 'receptor_razon_social'.", ))
+    def test_init_ok_razon_social_none(self) -> None:
+        _ = dataclasses.replace(
+            self.dte_l2_1,
+            emisor_razon_social=None,
+            receptor_razon_social=None,
+        )
 
     def test_init_fail_regression_signature_value_bytes_with_x20(self) -> None:
         bytes_value_with_x20_as_base64 = 'IN2pkDBxqDnGl4Pfvboi'