diff --git a/SOL009/NFVManoConfigurationAndInformationManagement-API/ChangeInterfaceStateTask.robot b/SOL009/NFVManoConfigurationAndInformationManagement-API/ChangeInterfaceStateTask.robot
new file mode 100644
index 0000000000000000000000000000000000000000..62b6383552e0e55e22b3c6c285b124eb3e57762e
--- /dev/null
+++ b/SOL009/NFVManoConfigurationAndInformationManagement-API/ChangeInterfaceStateTask.robot
@@ -0,0 +1,83 @@
+** Settings ***
+Library           JSONSchemaLibrary    schemas/
+Resource          environment/variables.txt
+Library           JSONLibrary
+Library           OperatingSystem
+Resource          NFVMANOCimKeywords.robot
+Library           REST    ${NFVMANO_SCHEMA}://${NFVMANO_HOST}:${NFVMANO_PORT}    ssl_verify=false
+Library           MockServerLibrary
+
+*** Test Cases ***
+POST Change interface state task
+    [Documentation]    Test ID: 8.3.1.7.1
+    ...    Test title: POST Change interface state task
+    ...    Test objective: The objective is send put request to change the state of the NFV-MANO service interface produced by the NFV-MANO functional entity
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.1 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Post request for Change interface state task
+    Check HTTP Response Status Code Is    202
+    Check Operation Occurrence Id
+    
+POST Change interface state task - Conflict
+    [Documentation]    Test ID: 8.3.1.7.2
+    ...    Test title: POST Change interface state task - Conflict
+    ...    Test objective: The objective is to test that request to cchange the state of the NFV-MANO service interface produced by the NFV-MANO functional entity failed due to a conflict with the state of the NFV-MANO entity resource and perform the JSON schema validation of the failed operation HTTP response.
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.1 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Post request for Change interface state task
+    Check HTTP Response Status Code Is    409
+    Check HTTP Response Body Json Schema Is   ProblemDetails
+    
+GET Change interface state task - Conflict - Method not implemented
+    [Documentation]    Test ID: 8.3.1.7.3
+    ...    Test title: GET Change interface state task - Conflict - Method not implemented
+    ...    Test objective: The objective is to test that GET method is not allowed to retrieve the changed state of the NFV-MANO functional entity application.
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.2 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Get request for Change interface state task
+    Check HTTP Response Status Code Is    405
+    
+PUT Change interface state task - Conflict - Method not implemented
+    [Documentation]    Test ID: 8.3.1.7.4
+    ...    Test title: PUT Change interface state task - Conflict - Method not implemented
+    ...    Test objective: The objective is to test that PUT method is not allowed to update the changed state of the NFV-MANO functional entity application.
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.3 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Put request for Change interface state task
+    Check HTTP Response Status Code Is    405
+    
+PATCH Change interface state task - Conflict - Method not implemented
+    [Documentation]    Test ID: 8.3.1.7.5
+    ...    Test title: PATCH Change interface state task - Conflict - Method not implemented
+    ...    Test objective: The objective is to test that PATCH method is not allowed to update the changed state of the NFV-MANO functional entity application.
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.4 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Patch request for Change interface state task
+    Check HTTP Response Status Code Is    405
+    
+DELETE Change interface state task - Conflict - Method not implemented
+    [Documentation]    Test ID: 8.3.1.7.6
+    ...    Test title: DELETE Change interface state task - Conflict - Method not implemented
+    ...    Test objective: The objective is to test that DELETE method is not allowed to delete the changed state of the NFV-MANO functional entity application.
+    ...    Pre-conditions: 
+    ...    Reference: clause 5.5.12.3.5 - ETSI GS NFV-SOL 009 [5] V3.3.1
+    ...    Config ID: Config_prod_NFV-MANO
+    ...    Applicability: none
+    ...    Post-Conditions: 
+    Send Delete request for Change interface state task
+    Check HTTP Response Status Code Is    405
\ No newline at end of file
diff --git a/SOL009/NFVManoConfigurationAndInformationManagement-API/NFVMANOCimKeywords.robot b/SOL009/NFVManoConfigurationAndInformationManagement-API/NFVMANOCimKeywords.robot
index b5479c3f8890b7c76e19a88ba37b4fe65bfd1789..ba2e36482bd91bd2894a46834f4b1e333cc26ed1 100644
--- a/SOL009/NFVManoConfigurationAndInformationManagement-API/NFVMANOCimKeywords.robot
+++ b/SOL009/NFVManoConfigurationAndInformationManagement-API/NFVMANOCimKeywords.robot
@@ -385,4 +385,47 @@ Send Delete request for Individual NFV-MANO Serive Interface
     Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization":"${AUTHORIZATION}"}
     Delete    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}
     ${outputResponse}=    Output    response
-	Set Global Variable    @{response}    ${outputResponse}
\ No newline at end of file
+	Set Global Variable    @{response}    ${outputResponse}
+	
+Send Post request for Change interface state task
+    Log    Trying to perform a POST for Change interface state task
+    Set Headers    {"Accept": "${ACCEPT_JSON}"}
+    Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization": "${AUTHORIZATION}"}
+    POST    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${output}=    Output    response
+    Set Suite Variable    ${response}    ${output}
+    
+Send Get request for Change interface state task
+    Log    Trying to perform a GET (method should not be implemented)
+    Set Headers    {"Accept": "${ACCEPT_JSON}"}
+    Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization": "${AUTHORIZATION}"}
+    GET    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${output}=    Output    response
+    Set Suite Variable    ${response}    ${output}
+    
+Send Put request for Change interface state task
+    Log    Trying to perform a PUT (method should not be implemented)
+    Set Headers    {"Accept": "${ACCEPT_JSON}"}
+    Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization": "${AUTHORIZATION}"}
+    GET    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${origOutput}=    Output    response
+    Set Suite Variable    ${origResponse}    ${origOutput}
+    PUT    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${output}=    Output    response
+    Set Suite Variable    ${response}    ${output}
+    
+Send Patch request for Change interface state task
+    Log    Trying to perform a PATCH (method should not be implemented)
+    Set Headers    {"Accept": "${ACCEPT_JSON}"}
+    Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization": "${AUTHORIZATION}"}
+    PATCH    ${apiRoot}/${apiName}/${apiMajorVersion}/mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${output}=    Output    response
+    Set Suite Variable    ${response}    ${output}
+
+Send Delete request for Change interface state task
+    Log    Trying to perform a DELETE (method should not be implemented)
+    Set Headers    {"Accept": "${ACCEPT_JSON}"}
+    Run Keyword If    ${AUTH_USAGE} == 1    Set Headers    {"Authorization": "${AUTHORIZATION}"}
+    DELETE    ${apiRoot}/${apiName}/${apiMajorVersion}//mano_entity/mano_interfaces/${manoServiceInterfaceId}/change_state
+    ${output}=    Output    response
+    Set Suite Variable    ${response}    ${output}
\ No newline at end of file