How To Fix FDM_MIRROR126 - Fields required in the IDoc do not have a value

SAP Error Message - Details

• Message type: E = Error

• Message class: FDM_MIRROR - Mirror System Messages

• Message number: 126

• Message text: Fields required in the IDoc do not have a value

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message FDM_MIRROR126 - Fields required in the IDoc do not have a value ?

  The SAP error message FDM_MIRROR126 indicates that certain fields required in the IDoc (Intermediate Document) do not have values. This error typically occurs during the processing of IDocs, which are used for data interchange between SAP systems and external systems.
  Cause:
  The error is caused by one or more mandatory fields in the IDoc not being populated with values. This can happen due to various reasons, such as:
  
  Missing Data: The source system did not provide the necessary data for the required fields.
  Mapping Issues: There may be a problem with the mapping configuration between the source and target systems, leading to fields not being filled correctly.
  Configuration Errors: The IDoc type or message type may not be configured correctly, leading to missing mandatory fields.
  Data Validation: The data being sent may not meet the validation criteria set in the target system, causing the fields to be left empty.
  
  Solution:
  To resolve the FDM_MIRROR126 error, you can follow these steps:
  
  
  Check IDoc Structure: Review the IDoc structure to identify which fields are mandatory. You can use transaction WE60 to view the IDoc documentation and see the required fields.
  
  
  Review Source Data: Ensure that the source system is providing all the necessary data for the mandatory fields. If data is missing, you may need to correct the data in the source system.
  
  
  Mapping Configuration: If you are using middleware (like SAP PI/PO or other ETL tools), check the mapping configuration to ensure that all required fields are being populated correctly.
  
  
  IDoc Generation: If you are generating IDocs programmatically, ensure that your code is populating all required fields before sending the IDoc.
  
  
  Error Logs: Check the error logs in transaction WE02 or WE05 to get more details about the specific IDoc that triggered the error. This can provide insights into which fields are missing values.
  
  
  Testing: After making the necessary corrections, test the IDoc processing again to ensure that the error is resolved.
  
  
  Related Information:
  
  IDoc Types: Familiarize yourself with the specific IDoc type you are working with, as different IDocs have different structures and requirements.
  SAP Documentation: Refer to SAP's official documentation for detailed information on IDocs, including mandatory fields and their purposes.
  Transaction Codes:
  
  WE02 / WE05: To monitor and analyze IDocs.
  WE60: To view IDoc documentation.
  BD87: To reprocess IDocs that have errors.
  
  
  
  By following these steps and checking the relevant configurations, you should be able to identify and resolve the issue causing the FDM_MIRROR126 error.