diff --git a/tests/messages/properties/complex/test_request.py b/tests/messages/properties/complex/test_request.py
new file mode 100644
index 00000000..916e348e
--- /dev/null
+++ b/tests/messages/properties/complex/test_request.py
@@ -0,0 +1,59 @@
+import pytest
+from tol_lab_share import error_codes
+from tol_lab_share.messages.properties.complex.request import Request
+from tol_lab_share.messages.properties.simple.dict_value import Value
+
+
+@pytest.fixture
+def valid_request(request):
+    return Value(
+        {
+            "costCode": "CostCode789",
+            "libraryType": "LibraryType123",
+            "studyUuid": b"12345678-1234-1234-1234-1234567890ab",
+            **request.param,
+        }
+    )
+
+
+@pytest.fixture
+def invalid_request():
+    return Value(
+        {
+            "costCode": 1234,
+            "studyUuid": "12345678-1234-1234-1234-1234567890ab",
+        }
+    )
+
+
+def check_error_is_present(sample, error_code, field):
+    assert any(
+        [((x.type_id == error_code.type_id) and (x.field == field)) for x in sample.errors]
+    ), f"Error type '{error_code.type_id}' for field '{field}' not found among {sample.errors}"
+
+
+class TestBioscanPoolXpSample:
+    @pytest.mark.parametrize(
+        "valid_request", [{}, {"genomeSize": ""}, {"genomeSize": "1,234,567,890 bp"}], indirect=True
+    )
+    def test_validators_when_request_is_valid(self, valid_request):
+        print(valid_request.value)
+        instance = Request(valid_request)
+        assert instance.validate() is True
+        assert len(instance.errors) == 0
+
+    def test_validators_when_request_incomplete(self):
+        instance = Request(Value({}))
+        assert instance.validate() is False
+        assert len(instance.errors) > 0
+
+    def test_validators_when_request_is_invalid(self, invalid_request):
+        instance = Request(invalid_request)
+        assert instance.validate() is False
+
+        check_error_is_present(instance, error_codes.ERROR_2_NOT_STRING, "cost_code")
+        check_error_is_present(instance, error_codes.ERROR_9_INVALID_INPUT, "library_type")
+        check_error_is_present(instance, error_codes.ERROR_1_UUID_NOT_BINARY, "study_uuid")
+        check_error_is_present(instance, error_codes.ERROR_2_UUID_NOT_RIGHT_FORMAT, "study_uuid")
+
+        assert len(instance.errors) == 4
diff --git a/tol_lab_share/messages/properties/complex/request.py b/tol_lab_share/messages/properties/complex/request.py
index 846e25f7..820aa8fb 100644
--- a/tol_lab_share/messages/properties/complex/request.py
+++ b/tol_lab_share/messages/properties/complex/request.py
@@ -1,5 +1,4 @@
 from .uuid import Uuid
-from .labware_type import LabwareType
 from tol_lab_share.constants.input_bioscan_pool_xp_to_traction_message import (
     REQUEST_COST_CODE,
     REQUEST_GENOME_SIZE,
@@ -7,10 +6,7 @@
     REQUEST_STUDY_UUID,
 )
 from tol_lab_share.messages.properties.simple import DictValue, StringValue
-from tol_lab_share.messages.traction import TractionReceptionMessage
-
 from tol_lab_share.messages.properties import MessageProperty
-from functools import singledispatchmethod
 
 import logging
 
@@ -23,20 +19,9 @@ class Request(MessageProperty):
     def __init__(self, input: MessageProperty):
         super().__init__(input)
 
-        self.add_property("cost_code", LabwareType(DictValue(input, REQUEST_COST_CODE)))
-        self.add_property("genome_size", StringValue(DictValue(input, REQUEST_GENOME_SIZE)))
+        self.add_property("cost_code", StringValue(DictValue(input, REQUEST_COST_CODE)))
+        self.add_property(
+            "genome_size", StringValue(DictValue(input, REQUEST_GENOME_SIZE, optional=True), optional=True)
+        )
         self.add_property("library_type", StringValue(DictValue(input, REQUEST_LIBRARY_TYPE)))
         self.add_property("study_uuid", Uuid(DictValue(input, REQUEST_STUDY_UUID)))
-
-    @singledispatchmethod
-    def add_to_message_property(self, message_property: MessageProperty) -> None:
-        super().add_to_message_property(message_property)
-
-    @add_to_message_property.register
-    def _(self, message: TractionReceptionMessage) -> None:
-        """Adds the request information to an OutputTractionMessage.
-
-        Args:
-            message (TractionReceptionMessage): The Traction reception message to add the data to.
-        """
-        super().add_to_message_property(message)