Tilo Eilebrecht commented on OLINGO-1146:

I am experiencing this issue too.

> CLONE - Cannot Filter on Navigation Property
> --------------------------------------------
>                 Key: OLINGO-1146
>                 URL: https://issues.apache.org/jira/browse/OLINGO-1146
>             Project: Olingo
>          Issue Type: Bug
>          Components: odata2-jpa
>    Affects Versions: V2 2.0.0
>            Reporter: igor nemtsov
>            Assignee: Michael Bolz
>             Fix For: V2 2.0.8
>         Attachments: olingo-414-exception.diff, olingo-414-patch.diff, 
> olingo-odata2-parent.patch
> We are receiving an error when we try to filter on a navigation property.  In 
> our solution we have a Notification entity and a User entity, we would like 
> to retrieve a specific Notification but only if it is linked to the 
> requesting user.  This would involve an ODATA request which filters on both 
> the UserId and the NotificationId.  An example of the URL we are invoking is:
> dspplatform.svc/Notifications?$filter=NotificationId%20eq%204%20and%20UserDetails/UserId%20eq%202
> This returns the following error:
> org.apache.olingo.odata2.core.edm.provider.EdmNavigationPropertyImplProv 
> cannot be cast to org.apache.olingo.odata2.api.edm.EdmProperty
> Can you please advise on how to perform filters on a Navigation property as 
> we need this as part of our core functionality?

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