Enter a business area

What causes this issue?

You selected rule &V3& for account &V2& in company code &V1&, meaning
the business area must always be specified. You do not need to enter
the valuation area; the entry is valid for all valuation areas

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?

Enter a business area, or change the rule for the specific account
assignments.

Error message extract from SAP system. Copyright SAP SE.