How To Fix FDT_EXPRESSIONS844 - Mapping parameter position &1: &2 is a unknown type

SAP Error Message - Details

• Message type: E = Error

• Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

• Message number: 844

• Message text: Mapping parameter position &1: &2 is a unknown type

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 FDT_EXPRESSIONS844 - Mapping parameter position &1: &2 is a unknown type ?

  The SAP error message FDT_EXPRESSIONS844 indicates that there is an issue with a mapping parameter in your SAP Data Services or SAP Fiori application. Specifically, it suggests that the mapping parameter at a certain position is of an unknown type, which means that the system cannot recognize or process the data type being used.
  Cause:
  
  Incorrect Data Type: The mapping parameter may be defined with a data type that is not recognized by the system. This could happen if the data type is custom or if there is a mismatch between the expected and actual data types.
  Missing or Incorrect Mapping: The mapping configuration may be incomplete or incorrectly set up, leading to the system being unable to identify the type of the parameter.
  Version Compatibility: If you are using a newer or older version of SAP Data Services or Fiori, there may be compatibility issues with certain data types.
  Corrupted Metadata: Sometimes, metadata can become corrupted, leading to issues with type recognition.
  
  Solution:
  
  Check Data Types: Review the mapping parameters and ensure that all data types are correctly defined and recognized by the system. Make sure that you are using standard data types supported by SAP.
  Review Mapping Configuration: Go through the mapping configuration to ensure that all parameters are correctly mapped and that there are no missing or incorrect entries.
  Update or Recreate Mappings: If the mappings are corrupted or incorrectly set up, consider updating or recreating them to ensure that they are correctly defined.
  Check for Updates: Ensure that your SAP system is up to date with the latest patches and updates, as these may resolve compatibility issues.
  Consult Documentation: Refer to the SAP documentation for the specific version you are using to understand the expected data types and mapping configurations.
  Contact SAP Support: If the issue persists, consider reaching out to SAP support for assistance, especially if you suspect a bug or a deeper issue with the system.
  
  Related Information:
  
  SAP Data Services Documentation: Review the official SAP documentation for Data Services to understand the supported data types and mapping configurations.
  SAP Community Forums: Engage with the SAP community forums where other users may have encountered similar issues and can provide insights or solutions.
  Error Logs: Check the error logs for more detailed information about the error, which may provide additional context for troubleshooting.
  
  By following these steps, you should be able to identify and resolve the issue related to the FDT_EXPRESSIONS844 error message.