Controlling area &, client & not found

What causes this issue?

In the COKL file, a transaction figure has been found that belongs to
controlling area &V1& in client &V2&. However, this controlling area
could not be found in table TKA01.

System Response

The equivalence number cannot be written to table COSL (periodic)
because the number of periods of the controlling area cannot be
determined.

How to fix this error?

Check the contents of the transaction figure tables. There is clearly
something wrong between the controlling area tables and the transaction
figure tables. A controlling area might have been deleted without the
transaction figures being completely deleted as well.

Error message extract from SAP system. Copyright SAP SE.