Functional area and cost of sales accounting (company code &1) active

What causes this issue?

The functional area was activated in the basic settings for Public
Sector Management. Cost of sales accounting is active in company code
&V1& at the same time. This setting is only permitted if the functional
area is determined on the entry screen in accordance with the settings
of the <DS:SIMG.V_FAGL_ACTIVECFC_DC>Enhancements for Determining the
Functional Area</>.

System Response

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

How to fix this error?

Procedure for System Administrators

Deactivate the functional area or the cost of sales accounting or set
the <DS:SIMG.V_FAGL_ACTIVECFC_DC>Determination of Functional Area</>
correctly.

Error message extract from SAP system. Copyright SAP SE.