Cost element &/& is defined as a secondary cost element

What causes this issue?

Account &V2& in chart of accounts &V1& is a secondary account that can
only be posted to by transactions within CO.

System Response

Processing is terminated.

How to fix this error?

If this account is correct, you must examine the account classification
or account assignment if the account is assigned to automatically.

Error message extract from SAP system. Copyright SAP SE.