How To Fix UCT8257 - Source selection derived from target field &1 is empty

SAP Error Message - Details

• Message type: E = Error

• Message class: UCT8 - Message class for UCT8(mapping)

• Message number: 257

• Message text: Source selection derived from target field &1 is empty

What causes this issue?

The system derives the source selection from the selection for target
field &V1&. The resulting source selection is empty.

System Response

The system cannot read any source data.

How to fix this error?

Examine the mapping rule for field &V1&. Make sure that the inversion of
the mapping rule does not produce an empty selection or lead to
conflicting values.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message UCT8257 - Source selection derived from target field &1 is empty ?

  The SAP error message UCT8257, which states "Source selection derived from target field &1 is empty," typically occurs in the context of data transfer or mapping processes, particularly when working with SAP's data migration tools or during the configuration of data sources and targets in various modules.
  Cause:
  The error indicates that the system is trying to derive a source value based on a target field, but the target field specified (denoted by &1) is empty or not populated. This can happen due to several reasons:
  
  Missing Data: The target field may not have been populated with any data, leading to an inability to derive the source value.
  Incorrect Mapping: There may be an issue with the mapping configuration where the source and target fields are not correctly aligned.
  Data Transfer Issues: If data is being transferred from one system to another, there may be issues with the data extraction or transformation process.
  Configuration Errors: There may be errors in the configuration settings of the data transfer process, such as incorrect field definitions or missing parameters.
  
  Solution:
  To resolve the UCT8257 error, you can take the following steps:
  
  
  Check Target Field: Verify that the target field (&1) is populated with the expected data. If it is empty, ensure that the data is correctly entered or transferred into that field.
  
  
  Review Mapping Configuration: Examine the mapping between the source and target fields. Ensure that the source field is correctly defined and that it corresponds to the target field in the data transfer process.
  
  
  Data Validation: If you are migrating data, validate the data in the source system to ensure that it contains the necessary values that should populate the target field.
  
  
  Debugging: If you have access to debugging tools, you can trace the data flow to identify where the data is being lost or not populated.
  
  
  Consult Documentation: Review SAP documentation or help resources related to the specific module or tool you are using to ensure that you are following the correct procedures.
  
  
  Seek Support: If the issue persists, consider reaching out to your SAP support team or consulting with SAP community forums for additional insights and assistance.
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Transaction Codes: Familiarize yourself with transaction codes related to data migration or configuration, such as LSMW (Legacy System Migration Workbench) or others relevant to your specific scenario.
  Data Migration Tools: If you are using specific data migration tools (like SAP Data Services), ensure that you are following best practices for data mapping and transformation.
  
  By following these steps, you should be able to identify the root cause of the UCT8257 error and implement a solution to resolve it.