diff --git a/NEWS.md b/NEWS.md
index 4ba4ba6f5..99a4158a5 100644
--- a/NEWS.md
+++ b/NEWS.md
@@ -8,6 +8,7 @@
 * 422 Unprocessable Content Error while updating  Instances and Items with electronic access without URI field populated. [MODINV-1024](https://folio-org.atlassian.net/browse/MODINV-1024)
 * Error appears when edit via quickMARC MARC Instance shared from Member tenant [MODDATAIMP-1052](https://folio-org.atlassian.net/browse/MODDATAIMP-1052)
 * Fix mod-inventory OOM issue [MODINV-1023](https://folio-org.atlassian.net/browse/MODINV-1023)
+* Replace GET with POST request for fetching instances and holdings on /items endpoint to omit 414 error [MODINV-943](https://folio-org.atlassian.net/browse/MODINV-943)
 
 ## 20.2.0 2023-03-20
 * Inventory cannot process Holdings with virtual fields ([MODINV-941](https://issues.folio.org/browse/MODINV-941))
diff --git a/src/main/java/org/folio/inventory/resources/Items.java b/src/main/java/org/folio/inventory/resources/Items.java
index 977dcec8b..17c1ac4a4 100644
--- a/src/main/java/org/folio/inventory/resources/Items.java
+++ b/src/main/java/org/folio/inventory/resources/Items.java
@@ -341,7 +341,7 @@ protected void respondWithManyItems(
 
     String holdingsQuery = multipleRecordsCqlQuery(holdingsIds);
 
-    holdingsClient.getMany(holdingsQuery, holdingsIds.size(), 0,
+    holdingsClient.retrieveMany(holdingsQuery, holdingsIds.size(), 0,
       holdingsFetched::complete);
 
     holdingsFetched.thenAccept(holdingsResponse -> {
@@ -366,7 +366,7 @@ protected void respondWithManyItems(
 
       String instancesQuery = multipleRecordsCqlQuery(instanceIds);
 
-      instancesClient.getMany(instancesQuery, instanceIds.size(), 0,
+      instancesClient.retrieveMany(instancesQuery, instanceIds.size(), 0,
         instancesFetched::complete);
 
       instancesFetched.thenAccept(instancesResponse -> {
diff --git a/src/main/java/org/folio/inventory/storage/external/CollectionResourceClient.java b/src/main/java/org/folio/inventory/storage/external/CollectionResourceClient.java
index 39d748917..d57ad77ab 100644
--- a/src/main/java/org/folio/inventory/storage/external/CollectionResourceClient.java
+++ b/src/main/java/org/folio/inventory/storage/external/CollectionResourceClient.java
@@ -68,6 +68,25 @@ public void getMany(
       .thenAccept(responseHandler);
   }
 
+  /**
+   * Run the query using some limit and offset.
+   *
+   * @param cqlQuery the query without percent (url) encoding
+   */
+  public void retrieveMany(
+    String cqlQuery,
+    Integer pageLimit,
+    Integer pageOffset,
+    Consumer<Response> responseHandler) {
+    var body = new JsonObject()
+      .put("query", cqlQuery)
+      .put("limit", pageLimit)
+      .put("offset", pageOffset);
+    var url = collectionRoot + "/retrieve";
+    client.post(url, body)
+      .thenAccept(responseHandler);
+  }
+
   /**
    * Runs the query while setting limit to maximum and offset to zero to get all records.
    *
diff --git a/src/test/java/support/fakes/FakeStorageModule.java b/src/test/java/support/fakes/FakeStorageModule.java
index 84e20583b..c60495492 100644
--- a/src/test/java/support/fakes/FakeStorageModule.java
+++ b/src/test/java/support/fakes/FakeStorageModule.java
@@ -82,6 +82,7 @@ void register(Router router) {
     router.route(pathTree).handler(this::emulateFailureIfNeeded);
     router.route(pathTree).handler(this::checkTokenHeader);
 
+    router.post(rootPath + "/retrieve").handler(this::retrieveMany);
     router.post(rootPath).handler(this::checkRequiredProperties);
     router.post(rootPath).handler(this::checkUniqueProperties);
     router.post(rootPath + "/emulate-failure").handler(this::emulateFailure);
@@ -266,6 +267,37 @@ private void getMany(RoutingContext routingContext) {
     JsonResponse.success(routingContext.response(), result);
   }
 
+  private void retrieveMany(RoutingContext routingContext) {
+    WebContext context = new WebContext(routingContext);
+    var requestBody = routingContext.getBodyAsJson();
+
+    var limit = requestBody.getInteger("limit");
+    var offset = requestBody.getInteger("offset");
+    var query = requestBody.getString("query");;
+
+    System.out.printf("Handling %s%n", routingContext.request().uri());
+
+    Map<String, JsonObject> resourcesForTenant = getResourcesForTenant(context);
+
+    List<JsonObject> filteredItems = new FakeCQLToJSONInterpreter(false)
+      .execute(resourcesForTenant.values(), query);
+
+    List<JsonObject> pagedItems = filteredItems.stream()
+      .skip(offset)
+      .limit(limit)
+      .collect(Collectors.toList());
+
+    JsonObject result = new JsonObject();
+
+    result.put(collectionPropertyName, new JsonArray(pagedItems));
+    result.put("totalRecords", filteredItems.size());
+
+    System.out.printf("Found %s resources: %s%n", recordTypeName,
+      result.encodePrettily());
+
+    JsonResponse.success(routingContext.response(), result);
+  }
+
   private void empty(RoutingContext routingContext) {
     WebContext context = new WebContext(routingContext);