diff --git a/front/public/locales/en/operationalStudies/manageTrainSchedule.json b/front/public/locales/en/operationalStudies/manageTrainSchedule.json
index 45c6572c79f..ef6e0947af7 100644
--- a/front/public/locales/en/operationalStudies/manageTrainSchedule.json
+++ b/front/public/locales/en/operationalStudies/manageTrainSchedule.json
@@ -91,6 +91,7 @@
   "pathfinding": "Path search",
   "pathfindingDone": "Pathfinding done.",
   "pathfindingError": "An error occurred in pathfinding: {{errorMessage}}.",
+  "InvalidTrainScheduleStep": "At least one of the waypoints could not be recognized",
   "pathfindingInProgress": "Pathfinding in progress…",
   "pathfindingMissingParams": "Missing parameters for pathfinding: {{missingElements}}.",
   "pathfindingMissingParamsSimple": "Missing information for the search",
diff --git a/front/public/locales/fr/operationalStudies/manageTrainSchedule.json b/front/public/locales/fr/operationalStudies/manageTrainSchedule.json
index 1a7b6f70463..c7d1eac9065 100644
--- a/front/public/locales/fr/operationalStudies/manageTrainSchedule.json
+++ b/front/public/locales/fr/operationalStudies/manageTrainSchedule.json
@@ -91,6 +91,7 @@
   "pathfinding": "Recherche d’itinéraire",
   "pathfindingDone": "Recherche d'itinéraire terminée.",
   "pathfindingError": "Erreur dans la recherche d’itinéraire : {{errorMessage}}.",
+  "InvalidTrainScheduleStep": "Au moins un des points de passage n'a pas été reconnu",
   "pathfindingInProgress": "Recherche d’itinéraire en cours…",
   "pathfindingMissingParams": "Éléments manquants pour la recherche : {{missingElements}}.",
   "pathfindingMissingParamsSimple": "Informations manquantes pour la recherche",
diff --git a/front/src/modules/pathfinding/components/Pathfinding/Pathfinding.tsx b/front/src/modules/pathfinding/components/Pathfinding/Pathfinding.tsx
index 18cf6b00ded..b36ab2662cd 100644
--- a/front/src/modules/pathfinding/components/Pathfinding/Pathfinding.tsx
+++ b/front/src/modules/pathfinding/components/Pathfinding/Pathfinding.tsx
@@ -1,3 +1,5 @@
+import { useEffect } from 'react';
+
 import { Alert, CheckCircle, Stop } from '@osrd-project/ui-icons';
 import cx from 'classnames';
 import { isEqual } from 'lodash';
@@ -10,6 +12,7 @@ import infraLogo from 'assets/pictures/components/tracks.svg';
 import { Spinner } from 'common/Loaders';
 import { useOsrdConfSelectors } from 'common/osrdContext';
 import { usePathfinding } from 'modules/pathfinding/hooks/usePathfinding';
+import { isPathStepInvalid } from 'modules/pathfinding/utils';
 import { useStoreDataForRollingStockSelector } from 'modules/rollingStock/components/RollingStockSelector/useStoreDataForRollingStockSelector';
 import { conditionalStringConcat, formatKmValue } from 'utils/strings';
 
@@ -23,13 +26,16 @@ type PathfindingProps = {
 const Pathfinding = ({ pathProperties, setPathProperties }: PathfindingProps) => {
   const { t } = useTranslation(['operationalStudies/manageTrainSchedule']);
 
-  const { getOrigin, getDestination } = useOsrdConfSelectors();
+  const { getOrigin, getDestination, getPathSteps } = useOsrdConfSelectors();
+  const pathSteps = useSelector(getPathSteps);
+  const hasInvalidPathStep = pathSteps.some((pathStep) => isPathStepInvalid(pathStep));
   const origin = useSelector(getOrigin, isEqual);
   const destination = useSelector(getDestination, isEqual);
   const { rollingStock } = useStoreDataForRollingStockSelector();
 
   const {
     pathfindingState,
+    pathfindingDispatch,
     infraInfos: { infra, reloadCount },
   } = usePathfinding(setPathProperties, pathProperties);
 
@@ -61,7 +67,8 @@ const Pathfinding = ({ pathProperties, setPathProperties }: PathfindingProps) =>
         !pathfindingState.running &&
         pathfindingState.done &&
         origin &&
-        destination && (
+        destination &&
+        !hasInvalidPathStep && (
           <div className="content pathfinding-done">
             <span className="lead" data-testid="result-pathfinding-done">
               <CheckCircle />
@@ -83,7 +90,7 @@ const Pathfinding = ({ pathProperties, setPathProperties }: PathfindingProps) =>
         </div>
       ) : (
         <>
-          {pathfindingState.error && (
+          {(pathfindingState.error || hasInvalidPathStep) && (
             <div
               className={cx('content pathfinding-error', {
                 'mt-2': infra && infra.state !== 'CACHED',
@@ -93,7 +100,9 @@ const Pathfinding = ({ pathProperties, setPathProperties }: PathfindingProps) =>
                 <Stop />
               </span>
               <span className="flex-grow-1">
-                {t('pathfindingError', { errorMessage: t(pathfindingState.error) })}
+                {hasInvalidPathStep
+                  ? t('InvalidTrainScheduleStep')
+                  : t('pathfindingError', { errorMessage: t(pathfindingState.error) })}
               </span>
             </div>
           )}
diff --git a/front/src/modules/pathfinding/hooks/usePathfinding.ts b/front/src/modules/pathfinding/hooks/usePathfinding.ts
index 72f68893177..c9d26089106 100644
--- a/front/src/modules/pathfinding/hooks/usePathfinding.ts
+++ b/front/src/modules/pathfinding/hooks/usePathfinding.ts
@@ -6,7 +6,6 @@ import { useSelector } from 'react-redux';
 
 import type { ManageTrainSchedulePathProperties } from 'applications/operationalStudies/types';
 import type {
-  PathfindingInputError,
   PostInfraByInfraIdPathPropertiesApiArg,
   PostInfraByInfraIdPathfindingBlocksApiArg,
   RollingStockWithLiveries,
@@ -18,7 +17,6 @@ import type { PathfindingAction, PathfindingState } from 'modules/pathfinding/ty
 import {
   formatSuggestedOperationalPoints,
   getPathfindingQuery,
-  matchPathStepAndOp,
   upsertPathStepsInOPs,
 } from 'modules/pathfinding/utils';
 import { useStoreDataForRollingStockSelector } from 'modules/rollingStock/components/RollingStockSelector/useStoreDataForRollingStockSelector';
@@ -181,18 +179,7 @@ export const usePathfinding = (
 
   const generatePathfindingParams = (): PostInfraByInfraIdPathfindingBlocksApiArg | null => {
     setPathProperties?.(undefined);
-
-    const filteredPathSteps = pathSteps.filter(
-      (step) => step !== null && step.coordinates !== null && !step.isInvalid
-    );
-
-    return getPathfindingQuery({
-      infraId,
-      rollingStock,
-      origin,
-      destination,
-      pathSteps: filteredPathSteps,
-    });
+    return getPathfindingQuery({ infraId, rollingStock, origin, destination, pathSteps });
   };
 
   useEffect(() => {
@@ -219,36 +206,7 @@ export const usePathfinding = (
         },
       });
     }
-  }, [origin?.id, destination?.id, rollingStock]);
-
-  const handleInvalidPathItems = (
-    steps: (PathStep | null)[],
-    invalidPathItems: Extract<PathfindingInputError, { error_type: 'invalid_path_items' }>['items']
-  ) => {
-    // TODO: we currently only handle invalid pathSteps with trigram. We will have to do it for trackOffset, opId and uic too.
-    const invalidTrigrams = invalidPathItems
-      .map((item) => {
-        if ('trigram' in item.path_item) {
-          return item.path_item.trigram;
-        }
-        return null;
-      })
-      .filter((trigram): trigram is string => trigram !== null);
-    if (invalidTrigrams.length > 0) {
-      const updatedPathSteps = steps.map((step) => {
-        if (step && 'trigram' in step && invalidTrigrams.includes(step.trigram)) {
-          return { ...step, isInvalid: true };
-        }
-        return step;
-      });
-
-      dispatch(updatePathSteps({ pathSteps: updatedPathSteps }));
-      pathfindingDispatch({ type: 'PATHFINDING_FINISHED' });
-      pathfindingDispatch({ type: 'PATHFINDING_PARAM_CHANGED' });
-    } else {
-      dispatch(setFailure({ name: t('pathfindingError'), message: t('missingPathSteps') }));
-    }
-  };
+  }, [origin, destination, rollingStock]);
 
   useEffect(() => {
     const startPathFinding = async () => {
@@ -271,13 +229,8 @@ export const usePathfinding = (
             pathfindingResult.status === 'failure' &&
             pathfindingResult.failed_status === 'pathfinding_not_found' &&
             pathfindingResult.error_type === 'incompatible_constraints';
-          if (
-            pathfindingResult.status === 'failure' &&
-            pathfindingResult.failed_status === 'pathfinding_input_error' &&
-            pathfindingResult.error_type === 'invalid_path_items'
-          ) {
-            handleInvalidPathItems(pathSteps, pathfindingResult.items);
-          } else if (pathfindingResult.status === 'success' || incompatibleConstraintsCheck) {
+
+          if (pathfindingResult.status === 'success' || incompatibleConstraintsCheck) {
             const pathResult =
               pathfindingResult.status === 'success'
                 ? pathfindingResult
@@ -303,8 +256,9 @@ export const usePathfinding = (
               // We update existing pathsteps with coordinates, positionOnPath and kp corresponding to the new pathfinding result
               const updatedPathSteps: (PathStep | null)[] = pathSteps.map((step, i) => {
                 if (!step) return step;
-                const correspondingOp = suggestedOperationalPoints.find((suggestedOp) =>
-                  matchPathStepAndOp(step, suggestedOp)
+                const correspondingOp = suggestedOperationalPoints.find(
+                  (suggestedOp) =>
+                    'uic' in step && suggestedOp.uic === step.uic && suggestedOp.ch === step.ch
                 );
 
                 const theoreticalMargin = i === 0 ? '0%' : step.theoreticalMargin;