diff --git a/api/utils/serializer/v1/compensation.py b/api/utils/serializer/v1/compensation.py
index 3cc22618..6fb8486d 100644
--- a/api/utils/serializer/v1/compensation.py
+++ b/api/utils/serializer/v1/compensation.py
@@ -11,7 +11,7 @@ from api.utils.serializer.v1.serializer import AbstractModelAPISerializerV1
 from codelist.settings import CODELIST_COMPENSATION_ACTION_ID, CODELIST_BIOTOPES_ID
 from compensation.models import Compensation, CompensationAction, CompensationState, UnitChoices
 from intervention.models import Intervention
-from konova.models import Geometry, Deadline
+from konova.models import Geometry, Deadline, DeadlineType
 from konova.tasks import celery_update_parcels
 from user.models import UserActionLogEntry
 
@@ -67,7 +67,7 @@ class CompensationAPISerializerV1(AbstractModelAPISerializerV1):
         return obj
 
     def set_intervention(self, obj, intervention_id, user):
-        """ Sets the linked intervention according to the given id
+        """ Sets the linked compensation according to the given id
 
         Fails if no such intervention found or user has no shared access
 
@@ -89,12 +89,25 @@ class CompensationAPISerializerV1(AbstractModelAPISerializerV1):
         return obj
 
     def set_deadlines(self, obj, deadline_data):
+        """ Sets the linked deadline data according to the given deadline_data
+
+
+        Args:
+            obj (Compensation): The Compensation object
+            deadline_data (dict): The posted deadline_data
+
+        Returns:
+            obj (Compensation)
+        """
         found_deadlines = []
         for entry in deadline_data:
             deadline_type = entry["type"]
             date = entry["date"]
             comment = entry["comment"]
 
+            if deadline_type not in DeadlineType:
+                raise ValueError(f"Invalid deadline type. Choices are {DeadlineType.values}")
+
             pre_existing_deadlines = obj.deadlines.filter(
                 type=deadline_type,
                 date=date,
@@ -115,6 +128,17 @@ class CompensationAPISerializerV1(AbstractModelAPISerializerV1):
         return obj
 
     def set_compensation_states(self, obj, states_data, states_manager):
+        """ Sets the linked compensation state data according to the given states_data
+
+
+        Args:
+            obj (Compensation): The Compensation object
+            states_data (dict): The posted states_data
+            states_manager (Manager): The before_states or after_states manager
+
+        Returns:
+            obj (Compensation)
+        """
         found_states = []
         for entry in states_data:
             biotope_type = entry["biotope"]
@@ -139,6 +163,16 @@ class CompensationAPISerializerV1(AbstractModelAPISerializerV1):
         return obj
 
     def set_compensation_actions(self, obj, actions_data):
+        """ Sets the linked compensation action data according to the given actions_data
+
+
+        Args:
+            obj (Compensation): The Compensation object
+            actions_data (dict): The posted actions_data
+
+        Returns:
+            obj (Compensation)
+        """
         found_actions = []
         for entry in actions_data:
             action = entry["action"]