How To Fix /IWBEP/SBOD158 - Function Import parameter '&1' does not have a type assignment

/IWBEP/SBOD158 - Overview

• Message type: E = Error

• Message class: /IWBEP/SBOD -

• Message number: 158

• Message text: Function Import parameter '&1' does not have a type assignment

Self-Explanatory Message

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/IWBEP/SBOD158 - Details

• The SAP error message /IWBEP/SBOD158 Function Import parameter '&1' does not have a type assignment typically occurs in the context of SAP Gateway and OData services. This error indicates that a function import parameter in your OData service does not have a defined data type, which is necessary for the service to process requests correctly.
  
  Cause:
  
  Missing Type Assignment: The function import parameter is defined in the OData service but lacks a corresponding data type assignment in the service metadata.
  Incorrect Model Definition: The data model may not be correctly defined, leading to parameters being recognized without types.
  Service Generation Issues: If the service was generated or updated without properly defining the parameters, this error can occur.
  
  
  Solution:
  To resolve this error, you can follow these steps:
  
  
  Check Function Import Definition:
  
  Go to the SAP Gateway Service Builder (transaction code SEGW).
  Locate the function import that is causing the issue.
  Ensure that all parameters of the function import have a