How To Fix SWF_EXP_001501 - Operator '&1': left operand missing

SAP Error Message - Details

• Message type: E = Error

• Message class: SWF_EXP_001 - Expression Service Messages

• Message number: 501

• Message text: Operator '&1': left operand missing

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 SWF_EXP_001501 - Operator '&1': left operand missing ?

  The SAP error message SWF_EXP_001501 with the description "Operator '&1': left operand missing" typically occurs in the context of workflow expressions in SAP Business Workflow. This error indicates that there is an issue with the expression used in a workflow step, specifically that the left operand of an operator is missing.
  Cause:
  The error is usually caused by one of the following:
  
  Incorrect Expression Syntax: The expression defined in the workflow step is not correctly formed. For example, if you are using an operator (like +, -, *, etc.) without a valid left operand.
  Missing Variable or Field: The variable or field that is expected to be on the left side of the operator is either not defined or is not accessible in the context of the workflow.
  Typographical Errors: There may be a typo in the expression that leads to the left operand being unrecognized.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check the Expression: Review the expression in the workflow step where the error occurs. Ensure that all operators have both left and right operands defined.
  
  
  Validate Variables: Ensure that all variables or fields used in the expression are correctly defined and accessible in the context of the workflow. Check for any spelling mistakes or incorrect references.
  
  
  Use the Expression Editor: If you are using the SAP GUI, utilize the expression editor to help construct the expression correctly. This tool can provide syntax checking and help avoid common mistakes.
  
  
  Debugging: If the issue persists, consider debugging the workflow to see the values of the variables at runtime. This can help identify if a variable is not being set correctly before the expression is evaluated.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for guidance on the specific operators and their expected operands.
  
  
  Testing: After making corrections, test the workflow to ensure that the error is resolved and that the workflow behaves as expected.
  
  
  Related Information:
  
  Workflow Configuration: Understanding how workflows are configured in SAP can help in troubleshooting such issues. Familiarize yourself with the workflow builder and expression syntax.
  SAP Notes: Check for any relevant SAP Notes that might address known issues or provide additional guidance on this error message.
  Community Forums: Consider searching or posting in SAP community forums or support channels for additional insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify and correct the cause of the SWF_EXP_001501 error in your SAP workflow.