How To Fix DT342 - & and proxy object & have different numbers of columns

SAP Error Message - Details

• Message type: E = Error

• Message class: DT - Table activation (incl. indexes)

• Message number: 342

• Message text: & and proxy object & have different numbers of columns

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message DT342 - & and proxy object & have different numbers of columns ?

  The SAP error message DT342 typically indicates a mismatch in the number of columns between a data source and a proxy object in a data transfer process. This can occur in various contexts, such as when working with Data Transfer Processes (DTPs), DataSources, or when using SAP BW (Business Warehouse) and SAP HANA.
  Cause:
  
  
  Mismatch in Structure: The most common cause of this error is that the structure of the data source (e.g., InfoSource, DataSource, or DSO) does not match the structure of the target object (e.g., InfoObject, DSO, or InfoCube). This can happen if:
  
  Columns have been added or removed from the source or target.
  The data types of the columns do not match.
  The order of the columns is different.
  
  
  
  Changes in Data Model: If there have been recent changes to the data model, such as modifications to the DataSource or the target object, this can lead to discrepancies.
  
  
  Incorrect Mapping: If the mapping between the source and target is not correctly defined, it can lead to this error.
  
  
  Solution:
  
  
  Check Data Source and Target Structure:
  
  Verify the structure of both the data source and the target object. Ensure that they have the same number of columns and that the data types match.
  If there are discrepancies, you may need to adjust the DataSource or the target object accordingly.
  
  
  
  Update the DTP:
  
  If you are using a Data Transfer Process (DTP), check the DTP settings and ensure that the mapping is correct. You may need to refresh or reconfigure the DTP.
  
  
  
  Recreate the DataSource or Target Object:
  
  If the mismatch is significant and cannot be easily resolved, consider recreating the DataSource or the target object to ensure they are aligned.
  
  
  
  Check for Recent Changes:
  
  Review any recent changes made to the data model or the objects involved. If changes were made, ensure that all related objects are updated accordingly.
  
  
  
  Test the Data Transfer:
  
  After making the necessary adjustments, test the data transfer again to ensure that the error has been resolved.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like RSA1 (Data Warehousing Workbench) to check the DataSources and InfoProviders.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  Documentation: Refer to SAP documentation for detailed information on Data Transfer Processes and data modeling in SAP BW.
  
  By following these steps, you should be able to identify and resolve the DT342 error in your SAP environment.