How To Fix WUF066 - Error while copying from &1 to &2: data lost - source = &3, target &4

SAP Error Message - Details

• Message type: E = Error

• Message class: WUF -

• Message number: 066

• Message text: Error while copying from &1 to &2: data lost - source = &3, target &4

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.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WUF066 - Error while copying from &1 to &2: data lost - source = &3, target &4 ?

  The SAP error message WUF066 indicates that there was an issue while copying data from one object to another, resulting in data loss. This error typically occurs in the context of data transfer processes, such as when using the SAP Data Transfer Workbench or during data migration activities.
  Cause:
  The error message WUF066 can be triggered by several factors, including:
  
  Data Inconsistency: The source data may have inconsistencies or errors that prevent it from being copied correctly to the target.
  Mapping Issues: There may be issues with the mapping of fields between the source and target objects, leading to data loss.
  Data Type Mismatch: The data types of the fields in the source and target may not match, causing the system to reject the data.
  Missing Required Fields: If the target object has required fields that are not populated in the source, this can lead to data loss.
  Technical Errors: There may be underlying technical issues, such as database locks or connectivity problems, that prevent the data from being copied successfully.
  
  Solution:
  To resolve the WUF066 error, you can take the following steps:
  
  Check Source Data: Review the source data for any inconsistencies or errors. Ensure that all required fields are populated and that the data is valid.
  Verify Mapping: Ensure that the mapping between the source and target objects is correct. Check that all fields are correctly aligned and that data types match.
  Review Target Structure: Check the structure of the target object to ensure that it can accommodate the data being copied. Make sure that all required fields are present and correctly defined.
  Error Logs: Review any error logs or detailed messages provided by SAP to identify specific issues that may have caused the error.
  Test with Sample Data: If possible, test the data transfer with a smaller set of sample data to isolate the issue and determine if it is related to specific records.
  Consult Documentation: Refer to SAP documentation or support notes related to the specific transaction or process you are using for additional guidance.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the WUF066 error. SAP frequently updates its knowledge base with solutions for common errors.
  Transaction Codes: Familiarize yourself with relevant transaction codes that may help in troubleshooting, such as SE11 (Data Dictionary), SE37 (Function Modules), or ST22 (Dump Analysis).
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they found effective.
  
  By following these steps, you should be able to identify the cause of the WUF066 error and implement a solution to resolve it.