How To Fix CM_EHFND_COMN156 - &1: Use of operator "&2" invalid

SAP Error Message - Details

• Message type: E = Error

• Message class: CM_EHFND_COMN - Commonly Used Messages

• Message number: 156

• Message text: &1: Use of operator "&2" invalid

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message CM_EHFND_COMN156 - &1: Use of operator "&2" invalid ?

  The SAP error message CM_EHFND_COMN156 typically indicates that there is an issue with the use of an operator in a specific context, often related to the use of expressions in the SAP system. This error can occur in various scenarios, such as when working with Business Rules, CDS views, or other areas where expressions are evaluated.
  Cause:
  
  
  Invalid Operator Usage: The error suggests that the operator being used (denoted by "&2" in the message) is not valid in the context where it is being applied. This could be due to:
  
  Using an operator that is not supported for the data types involved.
  Syntax errors in the expression.
  Logical errors in the way the expression is constructed.
  
  
  
  Data Type Mismatch: The operator may not be applicable to the data types of the operands involved in the expression.
  
  
  Contextual Restrictions: Certain operators may be restricted in specific contexts, such as within certain types of expressions or rules.
  
  
  Solution:
  
  
  Check Operator Validity: Review the operator being used and ensure that it is valid for the data types and context. Refer to the SAP documentation for a list of supported operators and their applicable contexts.
  
  
  Review Expression Syntax: Ensure that the syntax of the expression is correct. Look for any typos or misplaced operators.
  
  
  Data Type Compatibility: Verify that the data types of the operands are compatible with the operator. If there is a mismatch, consider converting the data types or using a different operator.
  
  
  Consult Documentation: Check the relevant SAP documentation or help resources for guidance on the specific operator and its usage.
  
  
  Debugging: If possible, use debugging tools to trace the execution and identify where the error occurs. This can provide insights into the specific conditions leading to the error.
  
  
  Seek Help from SAP Community: If the issue persists, consider reaching out to the SAP community forums or support for assistance. Provide details about the context in which the error occurs, including the specific expression and data types involved.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional context.
  SAP Community: Engage with the SAP Community for discussions related to similar issues and solutions shared by other users.
  Documentation: Review the official SAP documentation for the specific module or functionality you are working with to understand the expected usage of operators and expressions.
  
  By following these steps, you should be able to identify the cause of the error and implement a suitable solution.