How To Fix UCT8042 - Mapping rule for &1, row &2: Source selection is missing

SAP Error Message - Details

• Message type: E = Error

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

• Message number: 042

• Message text: Mapping rule for &1, row &2: Source selection is missing

What causes this issue?

The mapping rule for target field &V1& contains a condition or a
reassignment in row &V2&. No source selection or an empty source
selection is defined for the operator.

System Response

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

How to fix this error?

If the rule contains a condition, add the source fields in the details
and define the selection criteria.
If the rule contains a reassignment, add the source fields in the
details and define the selection criteria.

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 UCT8042 - Mapping rule for &1, row &2: Source selection is missing ?

  The SAP error message UCT8042 indicates that there is a problem with a mapping rule in the context of data transfer or data mapping processes, particularly in the SAP system's data migration or integration scenarios. The message specifies that the source selection is missing for a particular mapping rule, which means that the system cannot determine where to pull the data from for the specified mapping.
  
  Cause:
  
  Missing Source Selection: The mapping rule defined for the data transfer does not have a source selection defined. This could happen if the mapping was not fully configured or if there was an oversight during the setup.
  Incorrect Configuration: The mapping rule may have been incorrectly configured, leading to a situation where the source data cannot be identified.
  Data Model Changes: Changes in the data model or structure may have resulted in the source selection being invalid or missing.
  Transport Issues: If the mapping rules were transported from