How To Fix FAGL_LEDGER_CUST400 - Not possible to deactivate new General Ledger Accounting; see long text

FAGL_LEDGER_CUST400 - Overview

• Message type: E = Error

• Message class: FAGL_LEDGER_CUST - New General Ledger: Customizing

• Message number: 400

• Message text: Not possible to deactivate new General Ledger Accounting; see long text

What causes this issue?

The business function <LS>FI-AA, Parallel Valuation</> (<AB>
FIN_AA_PARALLEL_VAL</>) is activated.

System Response

Consequently, it is <ZH>not</> possible to deactivate new General Ledger
Accounting.

How to fix this error?

If appropriate, you first need to deactivate the business function <LS>
FI-AA, Parallel Valuation</> (<AB>FIN_AA_PARALLEL_VAL</>).
For this, see the documentation about deactivating business functions in
SAP Library under <LS>SAP ERP -> Business Functions -> Introduction:
Enhancement Packages and Business Functions -> Business Functions ->
Deactivating Business Functions</>.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.

FAGL_LEDGER_CUST400 - Details

• The SAP error message FAGL_LEDGER_CUST400 indicates that it is not possible to deactivate the new General Ledger Accounting (G/L) in your SAP system. This error typically arises when there are certain configurations or settings that prevent the deactivation of the new G/L functionality.
  
  Cause:
  
  Active New G/L Features: The new G/L accounting features, such as document splitting, are active in your system. If these features are in use, you cannot deactivate the new G/L.
  Open Periods: There may be open posting periods in the new G/L that prevent deactivation.
  Customizing Settings: Certain customizing settings related to the new G/L may be preventing the deactivation.
  Dependencies on Other Modules: Other modules or functionalities that rely on the new G/L may also be a factor.
  
  
  Solution:
  
  Check Active Features: Review the active features of the new G/L. If document splitting or other features are active, you will need to deactivate them first.
  Close Open Periods: Ensure that there are no