How To Fix UCT8002 - Mapping rule for &1, row &2: Source field &3 does not exist

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 002

• Message text: Mapping rule for &1, row &2: Source field &3 does not exist

What causes this issue?

The mapping rule for target field &V1& uses the source field &V3& in row
&V2&. However, source field &V3& is <ZH>not </>in the list of source
fields. This error can have the following causes:
The data type originally defined in method Customizing was changed
afterwards (after mapping was defined). This made the source field
invalid.
The source data basis originally defined in method Customizing was
changed afterwards. The original source field exists, but <ZH>not </>in
the new source data basis.
The source data basis was changed afterwards - for example, it points to
a different InfoProvider or InfoObject catalog that does <ZH>not
</>contain the original source field.

System Response

The settings cannot be saved. The system issues an error message.

How to fix this error?

Do one of the following:
Choose an existing source field.
Check that the source data basis is defined correctly and (if
applicable) switch to another source data basis.

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 UCT8002 - Mapping rule for &1, row &2: Source field &3 does not exist ?

  The SAP error message UCT8002 indicates that there is an issue with a mapping rule in a data transfer or transformation process. Specifically, it states that the source field specified in the mapping rule does not exist in the source data structure. This error typically occurs during data migration, data uploads, or when using tools like SAP Data Services or SAP S/4HANA Migration Cockpit.
  Cause:
  
  Incorrect Field Name: The field name specified in the mapping rule may be misspelled or incorrectly referenced.
  Field Not Available: The source data structure may not contain the specified field, possibly due to changes in the data model or schema.
  Version Mismatch: The source data structure may differ from the expected structure due to version changes in the source system or the target system.
  Configuration Issues: The mapping rules may not be properly configured, leading to references to non-existent fields.
  
  Solution:
  
  Verify Field Names: Check the mapping rule for any typos or incorrect field names. Ensure that the field names match exactly with those in the source data structure.
  Check Source Structure: Review the source data structure to confirm that the field exists. You can do this by examining the data model or schema in the source system.
  Update Mapping Rules: If the source structure has changed, update the mapping rules to reflect the current field names and structures.
  Consult Documentation: Refer to the relevant SAP documentation or data migration guides to ensure that you are using the correct field names and structures.
  Test with Sample Data: If possible, test the mapping with a smaller set of sample data to isolate the issue and confirm that the mapping works as expected.
  Check for Version Compatibility: Ensure that the source and target systems are compatible and that any necessary updates or migrations have been performed.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may address known issues or provide additional guidance on the error.
  Data Migration Tools: Familiarize yourself with the specific data migration tools being used (e.g., SAP Data Services, SAP S/4HANA Migration Cockpit) and their documentation for best practices.
  Community Forums: Engage with SAP community forums or support channels for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the cause of the UCT8002 error and implement the necessary corrections to resolve it.