Selection not possible (Automatic entry for only one area)

What causes this issue?

According to the selection you have made, both areas &V1& and &V2&
should post automatically to Financial Accounting. However, automatic
posting to FI can only be carried out for one 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?

Choose one of the two areas.

Error message extract from SAP system. Copyright SAP SE.