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