SAP Message UCF6609 - Statistical equity item for item &1 not defined

Diagnosis
No statistical equity item has been assigned to equity item &V1& underSettings -> Equity in Customizing for consolidation ofinvestments.
However, a statistical equity item must be assigned to each equity item.The assignment must be unambiguous in both directions - that is, it mustbe reversible.
The statistical equity item must have the same breakdown as the originalequity item, and must be enhanced with an additional breakdown bypartner.

Procedure
Add the missing assignment Customizing for consolidation of investments.