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.