Controlling area &, client & not found

What causes this issue?

When editing plan version &V3& in fiscal year &V4& in client &V2&,
controlling area &V1& was not found.

System Response

The system cannot determine the exchange rate type and the exchange
rate date. Initial values are therefore entered in the fields.

How to fix this error?

Please check the contents of table TKA07. The controlling area entries
and the plan versions are obviously out of sync. If necessary, you must
maintain the exchange rate type and exchange rate date manually using
customizing after you have maintained the controlling area tables.

Error message extract from SAP system. Copyright SAP SE.