SAP Message BP175 - Fiscal year variant & must not be changed

Diagnosis
You have tried to change the fiscal year variant after dependenttransaction data (such as plan or budget values) had already beencreated.
In a change of the fiscal year variant in the controlling area, thisdata would have to be converted because some of it might otherwise belost.
The standard for this release does not include any corrrespondingconversion programs.
Database conversions must be carried out by SAP personnel.

System Response
Processing stopped.

Procedure
Proceed as follows:
Choose System-->Services-->Reporting and run program RLEDNRCH.
Choose List-->Print to print the resulting log.
Describe in detail the changes you want to make.
Send all of this documentation to the SAP hotline, along with a shortdescription of the problem.