How To Fix RSTRAN621 - Field &1 already exists in segment

SAP Error Message - Details

• Message type: E = Error

• Message class: RSTRAN - Messages for Transformation

• Message number: 621

• Message text: Field &1 already exists in segment

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message RSTRAN621 - Field &1 already exists in segment ?

  The SAP error message RSTRAN621, which states "Field &1 already exists in segment," typically occurs during the data transfer process in SAP, particularly when working with data transfer processes (DTPs) or when loading data into InfoProviders. This error indicates that there is an attempt to add a field to a segment that already contains that field, which is not allowed.
  Cause:
  
  Duplicate Field Definition: The field that is being added to the segment already exists in the data structure. This can happen if the data source or transformation is incorrectly configured.
  Incorrect Mapping: The mapping between the source and target structures may be incorrectly defined, leading to an attempt to map the same field multiple times.
  Transformation Logic: If there are multiple transformations or data flows that reference the same field, it can lead to conflicts.
  
  Solution:
  
  Check Transformation Settings: Review the transformation settings in the Data Transfer Process (DTP) or the transformation itself. Ensure that the field is not being mapped more than once.
  Review Data Source: Check the data source to ensure that it does not contain duplicate fields or that the fields are not being pulled in from multiple sources.
  Adjust Field Mapping: If you find that the field is being mapped multiple times, adjust the mapping to ensure that each field is only mapped once.
  Modify Segment Structure: If necessary, modify the structure of the segment to accommodate the required fields without duplication.
  Test the DTP: After making changes, test the DTP or transformation to ensure that the error is resolved.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error. Sometimes, there may be known issues with specific versions of SAP that have been addressed in later updates.
  Documentation: Refer to SAP documentation on data transfer processes and transformations for best practices and guidelines on configuring these elements correctly.
  Community Forums: SAP Community and other forums can be helpful for finding similar issues faced by other users and the solutions they implemented.
  
  If the problem persists after following these steps, it may be beneficial to consult with an SAP Basis or BW consultant who can provide deeper insights into the specific configuration and data flow in your SAP environment.