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I'm trying to filter a column of type lookup from a list using this method.

/_vti_bin/ListData.svc/Collections()?$expand=Departments&$filter=Departments/Title eq 'Sales'

And its outputting the following error:

<message xml:lang="en-US">No property 'Title' exists in type 'System.Collections.Generic.IEnumerable`1[[Microsoft.SharePoint.Linq.DataServiceEntity, Microsoft.SharePoint.Linq, Version=14.0.0.0, Culture=neutral, PublicKeyToken=71e9bce111e9429c]]' at position 12.</message>

And found out that below does work in displaying the departments title, through selecting, meaning title does exist.

/_vti_bin/ListData.svc/Collections()?$expand=Departments&$select= Departments/Title

Am I missing something to be able to filter from a multiple lookup column?

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I assume it is by design. I can reproduce it if the lookup field can contain multiple references. If it is single lookup column, there is no error.

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