diff --git a/data/resource_lock_table.json b/data/resource_lock_table.json
index 6c10771..771c3fe 100644
--- a/data/resource_lock_table.json
+++ b/data/resource_lock_table.json
@@ -28,6 +28,42 @@
                 "SegmentLength": 3
             }]
         },
+        "ReadCase4": {
+            "Read": [{
+                "LockFlag": "DontLock",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "LockSame",
+                "SegmentLength": 1
+            }]
+        },
+        "ReadCase5": {
+            "Read": [{
+                "LockFlag": "DontLock",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "LockAll",
+                "SegmentLength": 1
+            }]
+        },
+        "ReadCase6": {
+            "Read": [{
+                "LockFlag": "LockSame",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "DontLock",
+                "SegmentLength": 1
+            }]
+        },
+        "ReadCase7": {
+            "Read": [{
+                "LockFlag": "LockAll",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "DontLock",
+                "SegmentLength": 1
+            }]
+        },
         "WriteCase1": {
             "Write": [{
                 "LockFlag": "LockAll",
@@ -54,8 +90,43 @@
                 "LockFlag": "LockSame",
                 "SegmentLength": 3
             }]
+         },
+         "WriteCase4": {
+            "Write": [{
+                "LockFlag": "DontLock",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "LockAll",
+                "SegmentLength": 1
+            }]
+         },
+         "WriteCase5": {
+            "Write": [{
+                "LockFlag": "DontLock",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "LockSame",
+                "SegmentLength": 1
+            }]
+         },
+         "WriteCase6": {
+            "Write": [{
+                "LockFlag": "LockAll",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "DontLock",
+                "SegmentLength": 1
+            }]
+         },
+         "WriteCase7": {
+            "Write": [{
+                "LockFlag": "LockSame",
+                "SegmentLength": 2
+            }, {
+                "LockFlag": "DontLock",
+                "SegmentLength": 1
+            }]
          }
-
     },
     "Invalid Case": {
         "ResourceIDInvalidDataType": "234",
diff --git a/openpower/ext_interfaces/test_lock_management.robot b/openpower/ext_interfaces/test_lock_management.robot
index 027cd26..ddfaabc 100644
--- a/openpower/ext_interfaces/test_lock_management.robot
+++ b/openpower/ext_interfaces/test_lock_management.robot
@@ -10,7 +10,7 @@
 Library              ../../lib/bmc_network_utils.py
 
 Suite Setup          Run Keyword And Ignore Error  Delete All Redfish Sessions
-Suite Teardown       Redfish.Logout
+Suite Teardown       Run Keyword And Ignore Error  Delete All Redfish Sessions
 Test Setup           Printn
 Test Teardown        FFDC On Test Case Fail
 
@@ -106,6 +106,18 @@
     HMCID-01       WriteCase1,ReadCase1
 
 
+Acquire Multiple Lock Request At CEC Level
+    [Documentation]  Acquire write lock on read lock under CEC level.
+    [Tags]  Acquire_Multiple_Lock_Request_At_CEC_Level
+    [Template]  Verify Acquire Multiple Lock Request At CEC Level
+
+    # client_id    lock_type
+    HMCID-01       ReadCase4,WriteCase4
+    HMCID-01       WriteCase5,ReadCase5
+    HMCID-01       ReadCase6,WriteCase6
+    HMCID-01       WriteCase7,ReadCase7
+
+
 Verify Release Of Valid Locks
     [Documentation]  Release all valid locks.
     [Tags]  Verify_Release_Of_Valid_Locks
@@ -380,7 +392,11 @@
     ${lock_dict_param}=  Form Data To Acquire Lock  ${lock_type}
     ${resp}=  Redfish Post Request  /ibm/v1/HMC/LockService/Actions/LockService.AcquireLock  data=${lock_dict_param}
     Should Be Equal As Strings  ${resp.status_code}  ${status_code}
-    ${resp}=  Return Description Of Response  ${resp.content}
+
+    Run Keyword If  ${status_code} == ${HTTP_BAD_REQUEST}
+    ...    Valid Value  ${BAD_REQUEST}  ['${resp.content}']
+    ...  ELSE
+    ...    Run Keyword And Return  Return Description Of Response  ${resp.content}
 
     [Return]  ${resp}
 
@@ -611,6 +627,18 @@
     Should Be Equal As Strings  ${resp.status_code}  ${status_code}
 
 
+Release locks And Delete Session
+    [Documentation]  Release locks and delete redfish session.
+    [Arguments]  ${session_info}  ${trans_id_list}
+
+    Release Locks On Resource  ${session_info}  ${trans_id_list}
+
+    ${trans_id_emptylist}=  Create List
+    Verify Lock On Resource  ${session_info}  ${trans_id_emptylist}
+
+    Redfish Delete Session  ${session_info}
+
+
 Acquire Lock On Another Lock
     [Documentation]  Acquire lock on another lock.
     [Arguments]  ${client_id}
@@ -629,11 +657,8 @@
     Append To List  ${trans_id_list}  ${trans_id}
 
     Verify Lock On Resource  ${session_info}  ${trans_id_list}
-    Release Locks On Resource  ${session_info}  ${trans_id_list}
 
-    ${trans_id_emptylist}=  Create List
-    Verify Lock On Resource  ${session_info}  ${trans_id_emptylist}
-    Redfish Delete Session  ${session_info}
+    Release locks And Delete Session  ${session_info}  ${trans_id_list}
 
 
 Verify Fail To Acquire Read And Write In Single Request
@@ -694,12 +719,8 @@
 
     Verify Lock On Resource  ${session_info}  ${trans_id_list}
     ${trans_id}=  Redfish Post Acquire Lock  ${lock_type_list}[1]  status_code=${HTTP_CONFLICT}
-    Release Locks On Resource  ${session_info}  ${trans_id_list}
 
-    ${trans_id_emptylist}=  Create List
-    Verify Lock On Resource  ${session_info}  ${trans_id_emptylist}
-
-    Redfish Delete Session  ${session_info}
+    Release locks And Delete Session  ${session_info}  ${trans_id_list}
 
 
 Verify Acquire Lock After Reboot
@@ -721,11 +742,31 @@
     ${trans_id}=  Redfish Post Acquire Lock  ${lock_type}
     Append To List  ${trans_id_list}  ${trans_id}
     Verify Lock On Resource  ${session_info}  ${trans_id_list}
-    Release Locks On Resource  ${session_info}  ${trans_id_list}  Transaction  ${HTTP_OK}
 
-    ${trans_id_emptylist}=  Create List
-    Verify Lock On Resource  ${session_info}  ${trans_id_emptylist}
-    Redfish Delete Session  ${session_info}
+    Release locks And Delete Session  ${session_info}  ${trans_id_list}
+
+
+Verify Acquire Multiple Lock Request At CEC Level
+    [Documentation]  Acquire lock in loop.
+    [Arguments]  ${client_id}  ${lock_type}
+
+    # Description of argument(s):
+    # client_id    This client id can contain string value
+    #              (e.g. 12345, "HMCID").
+    # lock_type    Read lock or Write lock.
+
+    ${trans_id_list}=  Create List
+    @{lock_type_list}=  Split String  ${lock_type}  ,
+    ${session_info}=  Create Redfish Session With ClientID  ${client_id}
+
+    ${trans_id}=  Redfish Post Acquire Lock  ${lock_type_list}[0]
+    Append To List  ${trans_id_list}  ${trans_id}
+
+    Verify Lock On Resource  ${session_info}  ${trans_id_list}
+
+    Redfish Post Acquire Lock  ${lock_type_list}[1]  status_code=${HTTP_CONFLICT}
+
+    Release locks And Delete Session  ${session_info}  ${trans_id_list}
 
 
 Verify Acquire And Release Lock In Loop