SAP Message UCT8061 - Mapping rule for &1, row &2: "Apply rule" operator &3 contains an error

Diagnosis
The mapping rule for target field &V1& contains an apply existingrule operator in row &V2&. The mapping rule this operator applies (
V3) contains errors.

System Response
The settings cannot be saved. The system issues this error message alongwith other messages that explore the cause of the error found in thereusable mapping rule.

Procedure
Review the error messages and correct the reused mapping rule - eitherhere in Customizing or where the mapping rule was originally defined.