rtc.data_models_aec: add validation for 'cedente_rut'

The 'cedente_rut' should be the DTE's 'emisor_rut' or the
last 'cesionario_rut' when the sequence is greater than 2
Condition sourced from document "Instructivo Técnico
Registro Público Electrónico de Transferencia de Crédito"
Source: (https://www.sii.cl/factura_electronica/ins_tecnico.pdf)

cl_sii/rtc/data_models_aec.py

@@ -768,6 +768,28 @@ def validate_last_cesion_matches_some_fields(
 
         return values
 
+    @pydantic.root_validator(skip_on_failure=True)
+    def validate_cesiones_rut_cedente_match_previous_rut_cesionario_or_dte_emisor(
+        cls, values: Mapping[str, object],
+    ) -> Mapping[str, object]:
+        dte = values['dte']
+        cesiones = values['cesiones']
+
+        if isinstance(dte, dte_data_models.DteXmlData) and isinstance(cesiones, Sequence):
+            dte_l1 = dte.as_dte_data_l1()
+            valid_cedente_rut = dte_l1.emisor_rut
+            for cesion in cesiones:
+                if cesion.cedente_rut != valid_cedente_rut:
+                    raise ValueError(
+                        f"'cedente_rut' of 'cesion' must match previous 'cesionario_rut'"
+                        f"  or DTE\'s 'emisor_rut' if there is no previuos 'cesion'"
+                        f" {cesion.cedente_rut!r} != {valid_cedente_rut!r}.",
+                    )
+
+                valid_cedente_rut = cesion.cesionario_rut
+
+        return values
+
     # @pydantic.root_validator
     # def validate_signature_value_and_signature_x509_cert_der_may_only_be_none_together(
     #     cls, values: Mapping[str, object],

tests/test_rtc_data_models_aec.py

@@ -678,3 +678,74 @@ def test_validate_last_cesion_matches_some_fields(self) -> None:
         self.assertEqual(len(validation_errors), len(expected_validation_errors))
         for expected_validation_error in expected_validation_errors:
             self.assertIn(expected_validation_error, validation_errors)
+
+    def test_validate_cedente_rut_matches_emisor_rut_in_cesion_seq_1(self) -> None:
+        self._set_obj_1()
+
+        obj = self.obj_1
+
+        expected_validation_errors = [
+            {
+                'loc': ('__root__',),
+                'msg':
+                    "'cedente_rut' of 'cesion' must match previous 'cesionario_rut'"
+                    "  or DTE\'s 'emisor_rut' if there is no previuos 'cesion'"
+                    " Rut('76389992-6')"
+                    " !="
+                    " Rut('76354771-K').",  # DTE's emisor RUT
+                'type': 'value_error',
+            },
+        ]
+
+        with self.assertRaises(pydantic.ValidationError) as assert_raises_cm:
+            dataclasses.replace(
+                obj,
+                cesiones=[
+                    dataclasses.replace(
+                        obj.cesiones[0],
+                        cedente_rut=obj.cesiones[0].cesionario_rut,
+                    ),
+                    obj.cesiones[1],
+                ],
+            )
+
+        validation_errors = assert_raises_cm.exception.errors()
+        self.assertEqual(len(validation_errors), len(expected_validation_errors))
+        for expected_validation_error in expected_validation_errors:
+            self.assertIn(expected_validation_error, validation_errors)
+
+    def test_validate_cedente_rut_matches_cesionario_rut_in_cesion_seq_2(self) -> None:
+        self._set_obj_1()
+
+        obj = self.obj_1
+
+        expected_validation_errors = [
+            {
+                'loc': ('__root__',),
+                'msg':
+                    "'cedente_rut' of 'cesion' must match previous 'cesionario_rut'"
+                    "  or DTE\'s 'emisor_rut' if there is no previuos 'cesion'"
+                    " Rut('76598556-0')"
+                    " !="
+                    " Rut('76389992-6').",  # RUT of the 'cesionario' of the 'cesion' sequence 1
+                'type': 'value_error',
+            },
+        ]
+
+        with self.assertRaises(pydantic.ValidationError) as assert_raises_cm:
+            dataclasses.replace(
+                obj,
+                cedente_rut=obj.cesiones[1].cesionario_rut,  # To skip previous validation
+                cesiones=[
+                    obj.cesiones[0],
+                    dataclasses.replace(
+                        obj.cesiones[1],
+                        cedente_rut=obj.cesiones[1].cesionario_rut,
+                    ),
+                ],
+            )
+
+        validation_errors = assert_raises_cm.exception.errors()
+        self.assertEqual(len(validation_errors), len(expected_validation_errors))
+        for expected_validation_error in expected_validation_errors:
+            self.assertIn(expected_validation_error, validation_errors)