How To Fix ISLM_API310 - Invalid signature type. Signature type must be 'Input' or 'Output'.

SAP Error Message - Details

• Message type: E = Error

• Message class: ISLM_API - API Messages

• Message number: 310

• Message text: Invalid signature type. Signature type must be 'Input' or 'Output'.

Self-Explanatory Message

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message ISLM_API310 - Invalid signature type. Signature type must be 'Input' or 'Output'. ?

  The SAP error message ISLM_API310: Invalid signature type. Signature type must be 'Input' or 'Output'. typically occurs in the context of using the SAP Integration Suite or when working with APIs in SAP systems. This error indicates that there is an issue with the signature type specified in the API call or configuration.
  Cause:
  
  Incorrect Signature Type: The error is primarily caused by specifying a signature type that is neither 'Input' nor 'Output'. This could happen due to a typo or incorrect configuration in the API definition.
  Configuration Issues: If the API is being configured in a way that does not adhere to the expected standards or formats, it can lead to this error.
  Version Mismatch: Sometimes, using an outdated version of the API or SDK can lead to compatibility issues, resulting in this error.
  
  Solution:
  
  Check API Configuration: Review the API configuration to ensure that the signature types are correctly defined as either 'Input' or 'Output'. Make sure there are no typos or incorrect values.
  Update API Definitions: If you are using a custom API, ensure that the definitions are up to date and conform to the expected standards.
  Consult Documentation: Refer to the official SAP documentation for the specific API you are working with to ensure that you are using the correct parameters and configurations.
  Testing: If possible, test the API call with a known working configuration to isolate the issue. This can help determine if the problem lies with the specific configuration you are using.
  Contact Support: If the issue persists after checking the configuration and documentation, consider reaching out to SAP support for further assistance.
  
  Related Information:
  
  SAP API Management: Understanding how to manage and configure APIs in SAP can help prevent such errors. Familiarize yourself with the API management tools provided by SAP.
  Integration Suite: If you are using the SAP Integration Suite, ensure that you are following best practices for API integration and management.
  Error Logs: Check the error logs for more detailed information about the error, which can provide additional context for troubleshooting.
  
  By following these steps, you should be able to resolve the ISLM_API310 error and ensure that your API calls are functioning correctly.