SAP Message RSPLS_CR021 - Combination '&1' is invalid; Valid is '&2': Characteristic '&3'

Diagnosis
You are either using a relation of type attribute in the characteristicrelationships or are using a navigation attribute. Characteristic '&V4&'is being used in the relation or is a navigation attribute.
Combination '&V1&' is not included in the master data table forcharacteristic '&V3&'. According to the master data table, only thecombination '&V2&' is valid.

System Response
In input-ready queries, cells of this type cannot be changed orfilled with data. In planning functions, data records that contain thiscombination cannot be generated.