How To Fix WL152 - Expression & only allows single-line values

SAP Error Message - Details

• Message type: E = Error

• Message class: WL - Workflow: run-time messages

• Message number: 152

• Message text: Expression & only allows single-line values

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message WL152 - Expression & only allows single-line values ?

  The SAP error message WL152, which states "Expression & only allows single-line values," typically occurs in the context of SAP Workflow or Business Workflow scenarios. This error indicates that the expression you are trying to use is expected to return a single-line value, but it is either returning multiple lines or is not formatted correctly.
  Cause:
  
  Multi-line Values: The expression you are using is returning a multi-line value instead of a single-line value. This can happen if you are trying to concatenate strings or retrieve data that spans multiple lines.
  Incorrect Data Type: The data type of the variable or expression being evaluated may not be compatible with the expected single-line format.
  Improper Syntax: There may be a syntax error in the expression that causes it to evaluate incorrectly.
  
  Solution:
  
  Check the Expression: Review the expression you are using to ensure that it is designed to return a single-line value. If it is pulling data from a table or structure, ensure that it is only fetching one record or one field.
  Use String Functions: If you need to concatenate multiple values, consider using string functions that can handle this appropriately, ensuring the result is a single line.
  Debugging: Use debugging tools in SAP to step through the workflow and see what values are being returned at each step. This can help identify where the multi-line value is being introduced.
  Modify Data Retrieval: If the expression is pulling data from a database or table, ensure that the query or selection criteria are set to return only a single record or value.
  Check Data Types: Ensure that the data types of the variables involved in the expression are compatible with single-line values.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for Workflow and expressions to understand the expected formats and data types.
  SAP Community: Engage with the SAP Community forums where other users may have encountered similar issues and can provide insights or solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes (like SWDD for workflow definition) to help you navigate and troubleshoot workflow issues effectively.
  
  By following these steps, you should be able to resolve the WL152 error and ensure that your expressions are correctly formatted to return single-line values.