Change balance sheet control in spite of account balance

What causes this issue?

You have changed the G/L account from a "balance sheet account" to a "P
&L account" or conversely.
The balance of the account is, however, not zero.

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?

Check your entries.
If the G/L account was already posted in the previous year, execute the
balance carryforward again for the current fiscal year. (program
SAPF011).
Note
You cannot execute the balance carryforward again for fiscal years that
have already endedn, as this would also change the balance sheet /
general ledger account for these fiscal years.
Technical Note
The phrase "Balance carryforward for fiscal year X" means that you
start the balance carryforward program and set te 'carryforward to
fiscal year' parameter to 'X'.
INCLUDE 'CUSTOMIZED_MESSAGE_INFO' OBJECT DOKU ID TX

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.