How To Fix /IWBEP/CM_V4S_RUN057 - Delta-token not allowed for non-collection response

SAP Error Message - Details

• Message type: E = Error

• Message class: /IWBEP/CM_V4S_RUN -

• Message number: 057

• Message text: Delta-token not allowed for non-collection response

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message /IWBEP/CM_V4S_RUN057 - Delta-token not allowed for non-collection response ?

  The SAP error message /IWBEP/CM_V4S_RUN057 Delta-token not allowed for non-collection response typically occurs in the context of OData services when a request is made that includes a delta token, but the response is not a collection type. This error is related to the handling of delta queries in OData services, particularly when using the SAP Gateway.
  Cause:
  
  Delta Token Misuse: The delta token is used to track changes in a collection of entities. If a request is made with a delta token but the service is returning a single entity or a non-collection response, this error will occur.
  Service Configuration: The OData service may not be configured to support delta queries for the specific entity or endpoint being accessed.
  Incorrect Request: The client may be incorrectly forming the request, including a delta token when it is not appropriate for the endpoint being accessed.
  
  Solution:
  
  Check the Request: Ensure that the request being made is appropriate for the endpoint. If you are querying a single entity, do not include a delta token in the request.
  Service Configuration: Verify that the OData service is configured to support delta queries for the specific entity set. This may involve checking the service implementation in the SAP Gateway.
  Use Collection Endpoints: If you need to use delta functionality, ensure that you are querying a collection endpoint (e.g., /EntitySet) rather than a single entity endpoint (e.g., /EntitySet(ID)).
  Review OData Version: Ensure that the OData version being used supports the features you are trying to implement. Delta queries are typically supported in OData V2 and V4, but the implementation may vary.
  Debugging: If you have access to the backend, consider debugging the OData service to see how it is processing the request and why it is returning a non-collection response.
  
  Related Information:
  
  OData Protocol: Familiarize yourself with the OData protocol, especially how delta queries work. The OData documentation provides insights into how to properly implement and use delta tokens.
  SAP Gateway Documentation: Review the SAP Gateway documentation for specific details on how to implement OData services and handle delta queries.
  SAP Community: Engage with the SAP Community forums for additional insights and solutions from other users who may have encountered similar issues.
  
  By following these steps, you should be able to resolve the error and ensure that your OData service is functioning as expected.