diff --git a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ConsolidatedProgressionChanges.tsx b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ConsolidatedProgressionChanges.tsx
index 5ee6caea81..330c56608c 100644
--- a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ConsolidatedProgressionChanges.tsx
+++ b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ConsolidatedProgressionChanges.tsx
@@ -29,18 +29,6 @@ type ProgressionChange =
     | IChangeRequestChangeMilestoneProgression
     | IChangeRequestDeleteMilestoneProgression;
 
-const getFirstChangeWithSnapshot = (
-    progressionChanges: ProgressionChange[],
-) => {
-    return (
-        progressionChanges.find(
-            (change) =>
-                change.payload?.snapshot &&
-                change.action === 'changeMilestoneProgression',
-        ) || progressionChanges.find((change) => change.payload?.snapshot)
-    );
-};
-
 const getMilestonesWithAutomation = (
     progressionChanges: ProgressionChange[],
 ): Set<string> => {
@@ -109,10 +97,7 @@ export const ConsolidatedProgressionChanges: FC<{
 
     if (progressionChanges.length === 0) return null;
 
-    const firstChangeWithSnapshot =
-        getFirstChangeWithSnapshot(progressionChanges);
-    const basePlan =
-        firstChangeWithSnapshot?.payload?.snapshot || currentReleasePlan;
+    const basePlan = currentReleasePlan;
 
     if (!basePlan) {
         return null;
diff --git a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ProgressionChange.tsx b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ProgressionChange.tsx
index 8108315a32..960302c2e3 100644
--- a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ProgressionChange.tsx
+++ b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/ProgressionChange.tsx
@@ -39,7 +39,7 @@ export const ProgressionChange: FC<ProgressionChangeProps> = ({
     onUpdateChangeRequestSubmit,
     onDeleteChangeRequestSubmit,
 }) => {
-    const basePlan = change.payload.snapshot || currentReleasePlan;
+    const basePlan = currentReleasePlan;
     if (!basePlan) return null;
 
     const sourceId = change.payload.sourceMilestone;
@@ -83,7 +83,9 @@ export const ProgressionChange: FC<ProgressionChangeProps> = ({
                 <MilestoneListRenderer
                     plan={modifiedPlan}
                     changeRequestState={changeRequestState}
-                    milestonesWithAutomation={new Set([sourceId])}
+                    milestonesWithAutomation={
+                        new Set([sourceId].filter(Boolean))
+                    }
                     onUpdateAutomation={onUpdateChangeRequestSubmit}
                     onDeleteAutomation={onDeleteChangeRequestSubmit}
                 />
diff --git a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/applyProgressionChanges.ts b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/applyProgressionChanges.ts
index a6c9d74c5a..2140f9478d 100644
--- a/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/applyProgressionChanges.ts
+++ b/frontend/src/component/changeRequest/ChangeRequest/Changes/Change/applyProgressionChanges.ts
@@ -23,8 +23,7 @@ export const applyProgressionChanges = (
             const deleteChange = progressionChanges.find(
                 (change): change is IChangeRequestDeleteMilestoneProgression =>
                     change.action === 'deleteMilestoneProgression' &&
-                    (change.payload.sourceMilestoneId === milestone.id ||
-                        change.payload.sourceMilestone === milestone.id),
+                    change.payload.sourceMilestone === milestone.id,
             );
 
             if (deleteChange) {
diff --git a/frontend/src/component/changeRequest/changeRequest.types.ts b/frontend/src/component/changeRequest/changeRequest.types.ts
index 03acf7e4e3..9fc35ffebb 100644
--- a/frontend/src/component/changeRequest/changeRequest.types.ts
+++ b/frontend/src/component/changeRequest/changeRequest.types.ts
@@ -2,10 +2,7 @@ import type { IFeatureVariant } from 'interfaces/featureToggle';
 import type { ISegment } from 'interfaces/segment';
 import type { IFeatureStrategy } from '../../interfaces/strategy.js';
 import type { IUser } from '../../interfaces/user.js';
-import type {
-    SetStrategySortOrderSchema,
-    ChangeMilestoneProgressionSchema,
-} from 'openapi';
+import type { SetStrategySortOrderSchema } from 'openapi';
 import type { IReleasePlan } from 'interfaces/releasePlans';
 
 type BaseChangeRequest = {
@@ -287,15 +284,14 @@ type ChangeRequestStartMilestone = {
     snapshot?: IReleasePlan;
 };
 
-type ChangeRequestChangeMilestoneProgression =
-    ChangeMilestoneProgressionSchema & {
-        snapshot?: IReleasePlan;
-    };
+type ChangeRequestChangeMilestoneProgression = {
+    sourceMilestone: string;
+    targetMilestone: string;
+    transitionCondition: { intervalMinutes: number };
+};
 
 type ChangeRequestDeleteMilestoneProgression = {
-    sourceMilestoneId?: string;
-    sourceMilestone?: string; // Backward compatibility for existing change requests
-    snapshot?: IReleasePlan;
+    sourceMilestone: string;
 };
 
 export type ChangeRequestAddStrategy = Pick<
diff --git a/frontend/src/hooks/api/actions/useChangeRequestApi/useChangeRequestApi.ts b/frontend/src/hooks/api/actions/useChangeRequestApi/useChangeRequestApi.ts
index c23ca074a6..52026b109b 100644
--- a/frontend/src/hooks/api/actions/useChangeRequestApi/useChangeRequestApi.ts
+++ b/frontend/src/hooks/api/actions/useChangeRequestApi/useChangeRequestApi.ts
@@ -22,8 +22,7 @@ export interface IChangeSchema {
         | 'addReleasePlan'
         | 'deleteReleasePlan'
         | 'startMilestone'
-        | 'createMilestoneProgression'
-        | 'updateMilestoneProgression'
+        | 'changeMilestoneProgression'
         | 'deleteMilestoneProgression';
     payload: string | boolean | object | number | undefined;
 }