The causative CO object in line &1 cannot be adjusted

What causes this issue?

The CO object of line &V1& causing the error cannot be adjusted. This
message is issued: &V2& : &V3&&V4& .

System Response

The system changes the account assignment and sets only the
characteristics for document splitting of the general ledgers. The
necessary CO account assignment must then be set by means of a default
account assignment.

How to fix this error?

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.