diff --git a/src/backend/InvenTree/InvenTree/models.py b/src/backend/InvenTree/InvenTree/models.py
index aaa2ca4fc1..2a0929128d 100644
--- a/src/backend/InvenTree/InvenTree/models.py
+++ b/src/backend/InvenTree/InvenTree/models.py
@@ -547,7 +547,7 @@ class InvenTreeParameterMixin(InvenTreePermissionCheckMixin, models.Model):
 
         Before deleting the model instance, delete any associated parameters.
         """
-        self.parameters.all().delete()
+        self.parameters_list.all().delete()
         super().delete(*args, **kwargs)
 
 
diff --git a/src/backend/InvenTree/common/models.py b/src/backend/InvenTree/common/models.py
index 301aeb8612..addfe484cb 100644
--- a/src/backend/InvenTree/common/models.py
+++ b/src/backend/InvenTree/common/models.py
@@ -50,6 +50,7 @@ from taggit.managers import TaggableManager
 
 import common.validators
 import InvenTree.conversion
+import InvenTree.exceptions
 import InvenTree.fields
 import InvenTree.helpers
 import InvenTree.models
@@ -2585,6 +2586,15 @@ class Parameter(
         """Validate the Parameter before saving to the database."""
         super().clean()
 
+        # Validate the parameter data against the template choices
+        if choices := self.template.get_choices():
+            if self.data not in choices:
+                raise ValidationError({'data': _('Invalid choice for parameter value')})
+
+        self.calculate_numeric_value()
+
+        # TODO: Check that the model_type for this parameter matches the template
+
         # Validate the parameter data against the template units
         if (
             get_global_setting(
@@ -2599,18 +2609,21 @@ class Parameter(
             except ValidationError as e:
                 raise ValidationError({'data': e.message})
 
-        # Validate the parameter data against the template choices
-        if choices := self.template.get_choices():
-            if self.data not in choices:
-                raise ValidationError({'data': _('Invalid choice for parameter value')})
+        # Finally, run custom validation checks (via plugins)
+        from plugin import PluginMixinEnum, registry
 
-        self.calculate_numeric_value()
-
-        # TODO: Check that the model_type for this parameter matches the template
-
-        # TODO: Validation of units (check global setting)
-
-        # TODO: Validate against plugins
+        for plugin in registry.with_mixin(PluginMixinEnum.VALIDATION):
+            # Note: The validate_part_parameter function may raise a ValidationError
+            try:
+                if hasattr(plugin, 'validate_parameter'):
+                    result = plugin.validate_parameter(self, self.data)
+                    if result:
+                        break
+            except ValidationError as exc:
+                # Re-throw the ValidationError against the 'data' field
+                raise ValidationError({'data': exc.message})
+            except Exception:
+                InvenTree.exceptions.log_error('validate_parameter', plugin=plugin.slug)
 
     def calculate_numeric_value(self):
         """Calculate a numeric value for the parameter data.
diff --git a/src/backend/InvenTree/plugin/base/integration/ValidationMixin.py b/src/backend/InvenTree/plugin/base/integration/ValidationMixin.py
index 0678bb3260..c67b88738e 100644
--- a/src/backend/InvenTree/plugin/base/integration/ValidationMixin.py
+++ b/src/backend/InvenTree/plugin/base/integration/ValidationMixin.py
@@ -227,9 +227,7 @@ class ValidationMixin:
         """
         return None
 
-    def validate_part_parameter(
-        self, parameter: part.models.PartParameter, data: str
-    ) -> Optional[bool]:
+    def validate_parameter(self, parameter, data: str) -> Optional[bool]:
         """Validate a parameter value.
 
         Arguments:
diff --git a/src/backend/InvenTree/plugin/samples/integration/validation_sample.py b/src/backend/InvenTree/plugin/samples/integration/validation_sample.py
index 903cc59b34..7a8592f25d 100644
--- a/src/backend/InvenTree/plugin/samples/integration/validation_sample.py
+++ b/src/backend/InvenTree/plugin/samples/integration/validation_sample.py
@@ -111,8 +111,8 @@ class SampleValidatorPlugin(SettingsMixin, ValidationMixin, InvenTreePlugin):
         if self.get_setting('IPN_MUST_CONTAIN_Q') and 'Q' not in ipn:
             self.raise_error("IPN must contain 'Q'")
 
-    def validate_part_parameter(self, parameter, data):
-        """Validate part parameter data.
+    def validate_parameter(self, parameter, data):
+        """Validate parameter data.
 
         These examples are silly, but serve to demonstrate how the feature could be used
         """