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1. "allowChange" flag should be provide by the user in AC definition properties.
   

   The example below shows the new flag in "org.onap.policy.clamp.acm.HttpAutomationCompositionElement" definition

         configurationEntities:
           type: map
           required: true
           allowChange: true
           entry_schema:
             type: org.onap.datatypes.policy.clamp.acm.httpAutomationCompositionElement.ConfigurationEntity
             type_version: 1.0.0
           description: The configuration entities the Automation Composition Element is managing and their associated REST requests
2. will create a new message type to send participant (AC_PROPERTIES_UPDATE) and new message type to send back (AC_PROPERTIES_UPDATE_ACK)
   
   
3. When a client needs to replace an existing Resource entirely, they can use PUT. When they're doing a partial update, they can use HTTP PATCH. (https://www.baeldung.com/http-put-patch-difference-spring) 

The example below shows endpoint and body of a patch to change the property configurationEntities:

- PATCH /onap/policy/clamp/acm/v2/compositions/{{compositionId}}/instances
# example
name: DemoInstance0
version: 1.0.1
compositionId: {{compositionId}}
instanceId: {{instanceId}}
elements:

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