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Subject: [OASIS Issue Tracker] (ODATA-749) What should service return when attempting to related two entities that are already related?


    [ https://issues.oasis-open.org/browse/ODATA-749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=50440#comment-50440 ] 

Ralf Handl commented on ODATA-749:
----------------------------------

I vote for successful no-op: the intent of the request was to have these entities related, and this is the case.

> What should service return when attempting to related two entities that are already related?
> --------------------------------------------------------------------------------------------
>
>                 Key: ODATA-749
>                 URL: https://issues.oasis-open.org/browse/ODATA-749
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: OData Protocol 
>    Affects Versions: V4.0_ERRATA02
>         Environment: [Proposed]
>            Reporter: Michael Pizzo
>            Priority: Minor
>             Fix For: V4.0_ERRATA03
>
>
> OData v4 protocol discusses how to add to the reference collection in a navigation property here:
> 11.4.6.1 Add a Reference to a Collection-Valued Navigation Property
> “A successful POST request to a navigation property's references collection adds a relationship to an existing entity. The request body MUST contain a single entity reference that identifies the entity to be added. See the appropriate format document for details.
> On successful completion, the response MUST be 204 No Content and contain an empty body.”
> It does not discuss what should happen if that reference already exists.  Should this succeed as a no-op or should the service throw an error saying the record already exists?  



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