How To Fix AQ590 - Fields & & cannot be linked

SAP Error Message - Details

• Message type: E = Error

• Message class: AQ - Message texts for SAP Query

• Message number: 590

• Message text: Fields & & cannot be linked

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message AQ590 - Fields & & cannot be linked ?

  The SAP error message AQ590, which states "Fields & & cannot be linked," typically occurs in the context of data processing or report generation within SAP systems. This error indicates that there is an issue with linking fields in a query or report, often due to mismatched data types, incompatible field definitions, or incorrect field mappings.
  Causes:
  
  Mismatched Data Types: The fields you are trying to link may have different data types (e.g., one is a character field while the other is numeric).
  Incompatible Field Definitions: The fields may not be defined in a way that allows them to be linked, such as different lengths or formats.
  Incorrect Field Mapping: The fields may not be correctly mapped in the query or report, leading to linkage issues.
  Missing Fields: One of the fields may not exist in the context of the query or report being executed.
  Database Constraints: There may be constraints in the underlying database that prevent the fields from being linked.
  
  Solutions:
  
  Check Data Types: Ensure that the fields you are trying to link have compatible data types. If necessary, convert one of the fields to match the other.
  Review Field Definitions: Verify the definitions of the fields in the data dictionary (e.g., Data Element, Domain) to ensure they are compatible.
  Correct Field Mapping: Review the query or report configuration to ensure that the fields are correctly mapped and linked.
  Field Existence: Confirm that both fields exist in the context of the query or report. If one is missing, you may need to adjust your query or report to include it.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on linking fields in the context you are working in.
  Debugging: If you have access to debugging tools, you can trace the execution of the query or report to identify where the linkage is failing.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Community Forums: SAP Community and other forums may have discussions or solutions from other users who have encountered the same error.
  SAP Help Portal: The SAP Help Portal can provide additional context and documentation on the specific module or functionality you are working with.
  
  If the issue persists after trying the above solutions, it may be beneficial to consult with your SAP Basis or technical team for further assistance.