How To Fix AJ125 - Simulation cannot be performed due to backbilling or final billing

SAP Error Message - Details

• Message type: E = Error

• Message class: AJ - Billing program

• Message number: 125

• Message text: Simulation cannot be performed due to backbilling or final billing

What causes this issue?

You wish to simulate billing for contract &v1&. However, you have
specified <DS:TX.ISU_BACKBILLING>backbilling</> or
<DS:TX.ISU_PERIOD_END_BILLING>period-end billing</> in the rate
category &v2& for the contract, and it is not possible to simulate
billing for a billing schema with backbilling or period-end billing.

System Response

Processing is terminated.

How to fix this error?

Use transaction <DS:TRAN.EASIM01>EASIM01</> (Simulation for Backbilling
and Period-End Billing).

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AJ125 - Simulation cannot be performed due to backbilling or final billing ?

  The SAP error message AJ125, which states "Simulation cannot be performed due to backbilling or final billing," typically occurs in the context of billing processes within SAP, particularly in modules related to billing and invoicing, such as SAP IS-U (Industry Solution for Utilities) or SAP SD (Sales and Distribution).
  Cause:
  This error usually arises when there are certain conditions in the billing process that prevent the simulation of billing documents. The most common causes include:
  
  
  Backbilling: This occurs when there are adjustments or corrections to previous billing periods that need to be processed. If there are open backbilling items, the system may not allow a simulation to ensure that the integrity of the billing process is maintained.
  
  
  Final Billing: If a final bill has already been issued for a customer or account, the system may restrict further simulations or changes to ensure that the finality of the billing is preserved.
  
  
  Incomplete Data: There may be missing or incomplete data in the billing document that prevents the simulation from being processed.
  
  
  Configuration Issues: There could be specific configuration settings in the SAP system that restrict simulations under certain conditions.
  
  
  Solution:
  To resolve the AJ125 error, you can take the following steps:
  
  
  Check for Open Backbilling Items: Review the billing documents and check if there are any open backbilling items. If so, you may need to process these items before attempting the simulation again.
  
  
  Review Final Billing Status: Ensure that the account or customer in question does not have a final bill issued. If a final bill exists, you may need to reverse it or create a new billing document that addresses the necessary adjustments.
  
  
  Data Validation: Verify that all required data for the billing document is complete and accurate. This includes checking customer master data, billing conditions, and any relevant transaction data.
  
  
  Consult Configuration Settings: If you have access to the configuration settings, check if there are any specific rules or settings that might be preventing the simulation. You may need to consult with your SAP administrator or functional consultant.
  
  
  Use Transaction Codes: Utilize relevant transaction codes (like FBL1N, FBL3N, or FBL5N) to check for open items or billing documents that may be causing the issue.
  
  
  Contact Support: If the issue persists after checking the above points, consider reaching out to your SAP support team or consulting SAP Notes for any known issues or patches related to this error.
  
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific fixes or updates related to error AJ125.
  Documentation: Review SAP documentation related to billing processes in your specific module (IS-U, SD, etc.) for more detailed guidance.
  User Forums: Engage with SAP community forums or user groups where similar issues may have been discussed.
  
  By following these steps, you should be able to identify the root cause of the AJ125 error and take appropriate action to resolve it.