How To Fix BRF656 - System unable to convert expression &1 automatically

SAP Error Message - Details

• Message type: E = Error

• Message class: BRF - Messages for Business Rule Framework

• Message number: 656

• Message text: System unable to convert expression &1 automatically

What causes this issue?

The system is unable to create any corresponding expression for a
certain functionality of BRF expression in the Formula and Derivation
Tool (FDT).

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

Try to create the expression manually in the FDT.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message BRF656 - System unable to convert expression &1 automatically ?

  The SAP error message BRF656 ("System unable to convert expression &1 automatically") typically occurs in the context of Business Rule Framework (BRF+) when the system is unable to automatically convert an expression or a value to the expected data type. This can happen for various reasons, such as data type mismatches, incorrect configurations, or issues with the expressions defined in the rules.
  Causes:
  
  Data Type Mismatch: The expression or value being processed does not match the expected data type. For example, trying to use a string where a number is expected.
  Invalid Expressions: The expression defined in the BRF+ rule may be incorrectly formulated or may reference non-existent fields or variables.
  Configuration Issues: There may be issues with the configuration of the BRF+ application or the specific rule set being used.
  Missing or Incorrectly Defined Data Elements: If the data elements or structures referenced in the expression are not defined correctly, it can lead to conversion issues.
  
  Solutions:
  
  Check Data Types: Review the data types of the variables and expressions involved in the rule. Ensure that they are compatible and correctly defined.
  Review Expressions: Go through the expressions defined in the BRF+ rules to ensure they are correctly formulated and reference valid fields or variables.
  Debugging: Use the BRF+ trace and debugging tools to identify where the conversion is failing. This can provide insights into which specific expression or value is causing the issue.
  Adjust Configuration: If there are configuration issues, review the BRF+ application settings and ensure that all necessary components are correctly configured.
  Consult Documentation: Refer to SAP documentation or help resources for BRF+ to understand the expected formats and types for expressions.
  
  Related Information:
  
  BRF+ Documentation: SAP provides extensive documentation on BRF+, including guidelines on how to define rules, expressions, and data types.
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide patches related to BRF+ errors.
  Community Forums: Engage with SAP community forums or support channels where other users may have encountered similar issues and can provide insights or solutions.
  
  If the issue persists after trying the above solutions, it may be beneficial to reach out to SAP support for further assistance, providing them with detailed information about the error and the context in which it occurs.