Planning data exists, you cannot delete the annual entry

What causes this issue?

You want to delete an annual entry for which planning data already
exists.

System Response

You cannot perform the deletion.

How to fix this error?

You can delete data of a plan version for a fiscal year using the
'Archive cost center plan data' program.
<DS:TRAN.OKE3>Proceed</>

Error message extract from SAP system. Copyright SAP SE.