Need to set the account ID twice for CampaignManagementService?

Question

We're using GetCampaignsByAccountIdRequest to get the list of campaigns in an account.
We found that we must set the account ID for the request to succeed:
GetCampaignsByAccountIdRequest.setAccountId(AccountId);
However, it seems it's also mandatory to set the account ID when crreating the java service stubs:
BasicHttpBinding_ICampaignManagementServiceStub _service;
CampaignManagementServiceLocator locator = new CampaignManagementServiceLocator();
_namespace = locator.getServiceName().getNamespaceURI();
_service = (BasicHttpBinding_ICampaignManagementServiceStub) locator.getBasicHttpBinding_ICampaignManagementService();
_service.clearHeaders();
_service.setHeader(_namespace, "CustomerAccountId", AccountId);
Do we indeed need to set the AccountId twice as above?
Thanks

Answer 1

As a best practice you should always specify the identifier of the account being accessed in the CustomerAccountId header
element. Some of the campaign management operations for example GetCampaignsByAccountId,
require that you specify the account ID in the request message body, and most of them require that you specify the account ID in the CustomerAccountId header
element.
In a future version of the API we plan to make this more consistent, for example exclude the AccountId from the body, and only require CustomerAccountId in the header. 
I hope this helps!