SAP Message RSPLS124 - Aggregation level &1: You cannot select key figure &2 (&3)

Diagnosis
You tried to select key figure &V2& in the definition of aggregationlevel &V1&. However, &V2& is a key figure that references &V3&.Referencing key figures are not permitted in aggregation levels.

System Response
You cannot select key figure &V2&.

Procedure
Deselect key figure &V2&.