How to get Campaign Activity Marketing List using OData query to Campaign Activity

Hello Devs,

How can I get campaign activity marketing list (related) records in an OData query call to CampaignActivitySet? like this:

https://<servername>/xRMServices/2011/OrganizationData.svc/CampaignActivitySet
	?&$expand=CampaignActivity_CampaignActivityItems
&$select=CampaignActivity_CampaignActivityItems

Above query returns with error:

'Microsoft.Crm.Sdk.Data.Services.CampaignActivity' does not have a property named 'CampaignActivity_CampaignActivityItems

However, I can get CampaignActivity_Tasks (related records) successfully.

The reason for this seems that this relation is not exposed in the 1:N Relationships of the Campaign Activity. Is there any way to achieve the same. 

I can get the marketing list records in another OData query call (/CampaignActivityItemSet)but I need this in a single trip to server side.

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