How To Fix REEXAA100 - RE Classic not allowed to be active together with FI-AA (new)

SAP Error Message - Details

• Message type: E = Error

• Message class: REEXAA - External Messages: Asset Accounting

• Message number: 100

• Message text: RE Classic not allowed to be active together with FI-AA (new)

What causes this issue?

You have activated the <LS>FI-AA, Parallel Valuation</> (<AB>
FIN_AA_PARALLEL_VAL</>) business function and the relevant Customizing
switch for Asset Accounting (new).
Deactivating <LS>Flexible Real Estate Management (RE-FX)</> would
automatically activate Classic RE. Classic RE, however, must <ZH>not</>
be activated together with Asset Accounting (new).

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?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message REEXAA100 - RE Classic not allowed to be active together with FI-AA (new) ?

  The SAP error message REEXAA100 indicates that there is a conflict between the Real Estate (RE) module and the Asset Accounting (FI-AA) module in SAP. Specifically, it states that the "RE Classic" functionality cannot be active simultaneously with the "FI-AA (new)" functionality. This is a common issue when transitioning from older versions of SAP to newer ones, particularly when dealing with the integration of different modules.
  Cause:
  The error occurs because the system is configured to use both the classic Real Estate (RE Classic) and the new Asset Accounting (FI-AA) functionalities, which are not compatible with each other. This typically happens when:
  
  The system is in the process of upgrading or migrating from an older version of SAP to a newer one.
  There are configuration settings that have not been updated to reflect the new functionalities.
  The system is trying to use both functionalities for the same business processes, which leads to conflicts.
  
  Solution:
  To resolve this error, you need to deactivate the RE Classic functionality if you intend to use the new FI-AA functionality. Here are the steps to do this:
  
  
  Check Configuration Settings: 
  
  Go to the configuration settings in the SAP system and check the settings for Real Estate and Asset Accounting.
  Ensure that the RE Classic is not activated if you are using the new FI-AA.
  
  
  
  Deactivate RE Classic:
  
  Navigate to the relevant configuration transaction (usually in SPRO) and look for the settings related to Real Estate Management.
  Deactivate the RE Classic functionality. This may involve changing settings in the "Real Estate Management" section.
  
  
  
  Review Dependencies:
  
  Ensure that there are no dependencies or transactions that are still relying on the RE Classic functionality. You may need to update or migrate data accordingly.
  
  
  
  Testing:
  
  After making the changes, perform thorough testing to ensure that the new FI-AA functionality works as expected without any conflicts.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to the specific versions you are using for any additional steps or considerations.
  
  
  
  Seek Support:
  
  If you are unsure about making these changes or if the issue persists, consider reaching out to SAP support or consulting with an SAP expert who can provide guidance based on your specific system configuration.
  
  
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or updates regarding this error message.
  Upgrade Guides: If you are in the process of upgrading, refer to the upgrade guides provided by SAP for best practices and steps to follow.
  Community Forums: Engage with SAP community forums or user groups where similar issues may have been discussed, and solutions shared.
  
  By following these steps, you should be able to resolve the REEXAA100 error and ensure that your SAP system is configured correctly for the functionalities you wish to use.