It is not possible to determine the interval

What causes this issue?

You want to maintain the <DS:TX.KEO_ANZAHL_GESCHAEFTSJAHRE>completeness
interval for the standard hierarchy</>.
Note that the subsequent final definition of the interval
[ First day of first period of shortest fiscal year,
Last day of last period of longest fiscal year ]
is determined from the fiscal year variant &V2& assigned to controlling
area &V1&.
When checking the fiscal year variants, the system found that either
No fiscal year variants are assigned to the controlling area, or
Not all fiscal year from the period current fiscal year +/- number of
fiscal years are defined in the assigned fiscal year variant.
<ZH>See also</> <DS:TX.KEO_EO_DESCRIPTION_GENERATE>Detail information
</>

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?

Ensure that:
A fiscal year variant is assigned to controlling area &V1& ->
<DS:TRAN.OX06>Check/Assign</>
All fiscal years from the completeness interval are created in this
variant -> <DS:TRAN.OB29>Check/Complete</>

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.