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@EJB private CRMProcessSubscriptionServiceActivationBean processSubscriptionServiceActivationBean;    
    
public CRMDOSubscriptionAction activateService(CRMDOSubscription subscription,CRMDOInstalledItem installedItem){
    
    ArrayList<CRMDOSubscriptionService> servicesToBeActivated = new ArrayList<CRMDOSubscriptionService>();
    
    //create the subscription service activation data object
    SubscriptionServiceActivation subscriptionServiceActivation= processSubscriptionServiceActivationBean.constructSubscriptionServiceActivation(subscription);
    //the list of the product that will be activated from the subscription
    //in this example the product that will be activated will be retrieve based on the installed item
    Set<SubscriptionActionProduct> servicesToBeProcessed = new HashSet<SubscriptionActionProduct>();
    
    //retrieve the subscription installed item.
    CRMDOSubscriptionInstalledItem subscriptionInstalledItem = (CRMDOSubscriptionInstalledItem)subscriptionInstalledItemBean.load(subscription, installedItem);
    
    //retrieve the related distributions of the installed item
    ArrayList<CRMDO> installedItemDistributions = subProvisioningDistributionBean.load(subscriptionInstalledItem);
    
    //retrieve all the service distributions 
    ArrayList<CRMDO> serviceDistributions = subProvisioningDistributionBean.loadServiceDistributions(subscription, null);
    
    //retrieve all the subscription services which is distributed to same distributor as installed item
    for (int i=0;i<installedItemDistributions.size();i++)
    {
        CRMDOSubProvisioningDistribution installedItemDistribution = (CRMDOSubProvisioningDistribution)installedItemDistributions.get(i);
        
        for (int j=0;j<serviceDistributions.size();j++)
        {
            CRMDOSubProvisioningDistribution serviceDistribution = (CRMDOSubProvisioningDistribution)serviceDistributions.get(j);
            if (serviceDistribution.getProvDistributor().equals(installedItemDistribution.getProvDistributor()))
            {
                if (!servicesToBeActivated.contains(serviceDistribution.getSubService()))
                {
                    servicesToBeActivated.add(serviceDistribution.getSubService());
                }
            }
        }
        
    }
    
    for (int i=0;i<servicesToBeActivated.size();i++)
    {
        CRMDOSubscriptionService subscriptionService =(CRMDOSubscriptionService)servicesToBeActivated.get(i);
        //create a new subscription action product data object where you will define the product that will be process by the action
        SubscriptionActionProduct subscriptionActionProduct =new SubscriptionActionProduct();
        subscriptionActionProduct.setIsDeleted(new Integer(0));
        subscriptionActionProduct.setProduct(subscriptionService.getProduct());
        subscriptionActionProduct.setSubService(subscriptionService);
        subscriptionActionProduct.setIsSelected(new Integer(1));
            
        servicesToBeProcessed.add(subscriptionActionProduct);
    }
    
    subscriptionServiceActivation.setServicesToBeProcessed(servicesToBeProcessed);
    
    //submit the subscription service activation data object in order to remove the product from subscription 
    //As a result is the subscription action data object.
    //the subscription action data object is the object which contains all the information about the action you perform on the subscription
    CRMDOSubscriptionAction subscriptionAction = processSubscriptionServiceDeactivationBean.submit(subscriptionServiceActivation);
}