How To Fix SADL_GW018 - Different message modes within one changeset are not supported

SAP Error Message - Details

• Message type: E = Error

• Message class: SADL_GW -

• Message number: 018

• Message text: Different message modes within one changeset are not supported

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SADL_GW018 - Different message modes within one changeset are not supported ?

  The SAP error message SADL_GW018 indicates that there is an issue with the way changesets are being handled in the SAP Gateway. Specifically, it means that different message modes (such as "POST", "PUT", "DELETE") are being mixed within a single changeset, which is not supported by the SAP Gateway.
  Cause:
  The error typically arises when you attempt to send multiple operations in a single changeset that use different HTTP methods. For example, if you are trying to perform a "POST" operation (to create a new entity) and a "DELETE" operation (to remove an entity) in the same changeset, the SAP Gateway will reject this request because it expects all operations in a changeset to use the same message mode.
  Solution:
  To resolve this error, you should ensure that all operations within a single changeset use the same HTTP method. Here are some steps you can take:
  
  
  Review Your Changeset: Check the operations you are trying to perform in the changeset. Make sure they all use the same HTTP method (e.g., all "POST" or all "PUT").
  
  
  Split Changesets: If you need to perform different types of operations (e.g., create and delete), split them into separate changesets. Each changeset should contain only operations of the same type.
  
  
  Check Your Code: If you are developing an application that interacts with the SAP Gateway, review the code that constructs the changesets. Ensure that it adheres to the requirement of using a single message mode per changeset.
  
  
  Testing: After making the necessary adjustments, test your changes to ensure that the error is resolved and that the operations are executed as expected.
  
  
  Related Information:
  
  SAP Gateway: The SAP Gateway is a technology that allows developers to create OData services that can be consumed by various clients, including web and mobile applications.
  OData Protocol: The Open Data Protocol (OData) is a standard protocol used for building and consuming RESTful APIs. Understanding OData conventions can help in structuring requests correctly.
  SAP Notes and Documentation: For more detailed information, you can refer to SAP Notes or the official SAP documentation related to the SAP Gateway and OData services.
  
  By following these guidelines, you should be able to resolve the SADL_GW018 error and successfully execute your operations against the SAP Gateway.