diff --git a/ompi/communicator/communicator.h b/ompi/communicator/communicator.h
index b678ea283c7..3a230b68025 100644
--- a/ompi/communicator/communicator.h
+++ b/ompi/communicator/communicator.h
@@ -25,6 +25,7 @@
  * Copyright (c) 2018-2024 Triad National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2023      Advanced Micro Devices, Inc. All rights reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -613,11 +614,6 @@ static inline struct ompi_proc_t* ompi_comm_peer_lookup (const ompi_communicator
     return ompi_group_peer_lookup(comm->c_remote_group,peer_id);
 }
 
-static inline bool ompi_comm_instances_same(const ompi_communicator_t *comm1, const ompi_communicator_t *comm2)
-{
-    return comm1->instance == comm2->instance;
-}
-
 #if OPAL_ENABLE_FT_MPI
 /*
  * Support for MPI_ANY_SOURCE point-to-point operations
diff --git a/ompi/mpi/c/testall.c b/ompi/mpi/c/testall.c
index 28d9ffc502c..4eac940b257 100644
--- a/ompi/mpi/c/testall.c
+++ b/ompi/mpi/c/testall.c
@@ -17,6 +17,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -57,31 +58,13 @@ int MPI_Testall(int count, MPI_Request requests[], int *flag,
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int i, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if( (NULL == requests) && (0 != count) ) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (i = 0; i < count; i++) {
-                if (NULL == requests[i]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (&ompi_request_empty == requests[i]) { 
-                    continue;
-                } else if (NULL == requests[i]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[i];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[i]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, count) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if ((NULL == flag) || (count < 0)) {
diff --git a/ompi/mpi/c/testany.c b/ompi/mpi/c/testany.c
index 4993ce729f0..8a70002d495 100644
--- a/ompi/mpi/c/testany.c
+++ b/ompi/mpi/c/testany.c
@@ -17,6 +17,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -56,31 +57,13 @@ int MPI_Testany(int count, MPI_Request requests[], int *indx, int *completed, MP
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int i, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if ((NULL == requests) && (0 != count)) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (i = 0; i < count; i++) {
-                if (NULL == requests[i]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (&ompi_request_empty == requests[i]) {
-                    continue;
-                } else if (NULL == requests[i]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[i];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[i]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, count) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if (((NULL == indx || NULL == completed) && count > 0) ||
diff --git a/ompi/mpi/c/testsome.c b/ompi/mpi/c/testsome.c
index 84ea14fabd7..459335ded67 100644
--- a/ompi/mpi/c/testsome.c
+++ b/ompi/mpi/c/testsome.c
@@ -17,6 +17,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -58,31 +59,13 @@ int MPI_Testsome(int incount, MPI_Request requests[],
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int indx, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if ((NULL == requests) && (0 != incount)) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (indx = 0; indx < incount; ++indx) {
-                if (NULL == requests[indx]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (&ompi_request_empty == requests[indx]) { 
-                    continue;
-                } else if (NULL == requests[indx]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[indx];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[indx]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, incount) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if (((NULL == outcount || NULL == indices) && incount > 0) ||
diff --git a/ompi/mpi/c/waitall.c b/ompi/mpi/c/waitall.c
index 14485de4e70..ce2353dfc9b 100644
--- a/ompi/mpi/c/waitall.c
+++ b/ompi/mpi/c/waitall.c
@@ -16,6 +16,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -55,31 +56,13 @@ int MPI_Waitall(int count, MPI_Request requests[], MPI_Status statuses[])
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int i, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if( (NULL == requests) && (0 != count) ) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (i = 0; i < count; i++) {
-                if (NULL == requests[i]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (&ompi_request_empty == requests[i]) {
-                    continue;
-                } else if (NULL == requests[i]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[i];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[i]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, count) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if (count < 0) {
diff --git a/ompi/mpi/c/waitany.c b/ompi/mpi/c/waitany.c
index 4b1dd771e3d..83c7fdf2a9e 100644
--- a/ompi/mpi/c/waitany.c
+++ b/ompi/mpi/c/waitany.c
@@ -17,6 +17,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -56,31 +57,13 @@ int MPI_Waitany(int count, MPI_Request requests[], int *indx, MPI_Status *status
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int i, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if ((NULL == requests) && (0 != count)) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (i = 0; i < count; i++) {
-                if (NULL == requests[i]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (requests[i] == &ompi_request_empty) {
-                    continue;
-                } else if (NULL == requests[i]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[i];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[i]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, count) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if ((NULL == indx && count > 0) ||
diff --git a/ompi/mpi/c/waitsome.c b/ompi/mpi/c/waitsome.c
index 169c7e10ec4..3b5b7ea3cc3 100644
--- a/ompi/mpi/c/waitsome.c
+++ b/ompi/mpi/c/waitsome.c
@@ -17,6 +17,7 @@
  *                         and Technology (RIST). All rights reserved.
  * Copyright (c) 2021      Triad National Security, LLC. All rights
  *                         reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -58,31 +59,13 @@ int MPI_Waitsome(int incount, MPI_Request requests[],
     );
 
     if ( MPI_PARAM_CHECK ) {
-        int indx, rc = MPI_SUCCESS;
-        MPI_Request check_req = NULL;
+        int rc = MPI_SUCCESS;
         OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
         if ((NULL == requests) && (0 != incount)) {
             rc = MPI_ERR_REQUEST;
         } else {
-            for (indx = 0; indx < incount; ++indx) {
-                if (NULL == requests[indx]) {
-                    rc = MPI_ERR_REQUEST;
-                    break;
-                }
-                if (&ompi_request_empty == requests[indx]) {
-                    continue;
-                } else if (NULL == requests[indx]->req_mpi_object.comm) {
-                    continue;
-                } else if (NULL == check_req) {
-                    check_req = requests[indx];
-                }
-                else {
-                    if (!ompi_comm_instances_same(requests[indx]->req_mpi_object.comm,
-                                                     check_req->req_mpi_object.comm)) {
-                        rc = MPI_ERR_REQUEST;
-                        break;
-                    }
-                }
+            if(!ompi_request_check_same_instance(requests, incount) ) {
+                rc = MPI_ERR_REQUEST;
             }
         }
         if (((NULL == outcount || NULL == indices) && incount > 0) ||
diff --git a/ompi/request/request.c b/ompi/request/request.c
index cd824392e41..9e736e66a9e 100644
--- a/ompi/request/request.c
+++ b/ompi/request/request.c
@@ -21,6 +21,7 @@
  * Copyright (c) 2018      Triad National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2022      IBM Corporation.  All rights reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -248,3 +249,25 @@ int ompi_request_persistent_noop_create(ompi_request_t** request)
     *request = req;
     return OMPI_SUCCESS;
 }
+
+bool ompi_request_check_same_instance(ompi_request_t** requests,
+                                      int count)
+{
+    ompi_request_t *req, *base = NULL;
+
+    for(int idx = 0; idx < count; idx++ ) {
+        req = requests[idx];
+        if(OMPI_REQUEST_NULL == req->req_type)  /* predefined requests are generic */
+            continue;
+        /* Only PML requests have support for MPI sessions */
+        if(OMPI_REQUEST_PML != req->req_type)
+            continue;
+        if(NULL == base) {
+            base = req;
+            continue;
+        }
+        if(base->req_mpi_object.comm != req->req_mpi_object.comm)
+            return false;
+    }
+    return true;
+}
diff --git a/ompi/request/request.h b/ompi/request/request.h
index e2e62a2d7ad..548c053a7bc 100644
--- a/ompi/request/request.h
+++ b/ompi/request/request.h
@@ -19,6 +19,7 @@
  * Copyright (c) 2018      Triad National Security, LLC. All rights
  *                         reserved.
  * Copyright (c) 2022      IBM Corporation.  All rights reserved.
+ * Copyright (c) 2024      NVIDIA Corporation.  All rights reserved.
  * $COPYRIGHT$
  *
  * Additional copyrights may follow
@@ -558,6 +559,22 @@ static inline int ompi_request_set_callback(ompi_request_t* request,
     return OMPI_SUCCESS;
 }
 
+/**
+ * Check if an array of requests contains only requests that belong to the same
+ * instance or MPI Session. Exclude predefined requests, that are generic and part
+ * of all instances.
+ * Right now, only tests for PML requests as they are the only requests that have
+ * support for MPI Sessions.
+ *
+ * @param requests (IN)   Array of requests
+ * @param count (IN)      Number of requests
+ * @return                true if all requests are part of the same instance
+ *                        or MPI Session, false otherwise.
+ *
+ */
+bool ompi_request_check_same_instance(ompi_request_t** requests,
+                                      int count);
+
 END_C_DECLS
 
 #endif