How To Fix AH599 - Billing class &1 does not match billing class &2 gas procedure &3

SAP Error Message - Details

• Message type: E = Error

• Message class: AH - IS-U billing (master data)

• Message number: 599

• Message text: Billing class &1 does not match billing class &2 gas procedure &3

What causes this issue?

If you change a calorific value procedure or a volume correction factor
procedure, the billing class for the procedure must match the usage
(possibly entered already) of the procedure in the specified gas
procedure.

System Response

How to fix this error?

Keep the billing class the same as it is in the gas procedure, or enter
a different calorific value/volume correction factor procedure in the
gas procedure.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message AH599 - Billing class &1 does not match billing class &2 gas procedure &3 ?

  The SAP error message AH599 indicates a mismatch between the billing class defined in the billing document and the billing class expected by the gas procedure. This error typically arises in the context of billing processes in the SAP IS-U (Industry Solution for Utilities) module, particularly when dealing with gas billing.
  Cause:
  The error occurs when:
  
  The billing class of the billing document (denoted as &1) does not match the billing class that is expected for the specific gas procedure (denoted as &2).
  This mismatch can happen due to configuration issues, such as incorrect settings in the billing class or gas procedure definitions.
  It may also occur if there are changes in the configuration that have not been properly reflected in the billing documents or if the gas procedure is not set up correctly for the billing class being used.
  
  Solution:
  To resolve this error, you can take the following steps:
  
  
  Check Configuration:
  
  Go to the configuration settings for billing classes and gas procedures in the SAP system.
  Ensure that the billing class assigned to the billing document is compatible with the gas procedure being used.
  
  
  
  Review Billing Document:
  
  Check the billing document that triggered the error. Look at the billing class and gas procedure assigned to it.
  Verify if the billing class is correctly assigned based on the business requirements.
  
  
  
  Adjust Gas Procedure:
  
  If necessary, adjust the gas procedure settings to ensure that it accepts the billing class being used.
  You may need to consult with your SAP functional consultant or system administrator to make these changes.
  
  
  
  Test Changes:
  
  After making any adjustments, test the billing process again to ensure that the error does not reoccur.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or notes related to billing classes and gas procedures for additional guidance and best practices.
  
  
  
  Contact SAP Support:
  
  If the issue persists after checking the configuration and making necessary adjustments, consider reaching out to SAP support for further assistance.
  
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like SPRO for configuration, FBL1N for vendor line items, or FB03 for displaying documents to investigate further.
  SAP Notes: Look for relevant SAP Notes that might address known issues or provide patches related to billing classes and gas procedures.
  User Exits and BAdIs: If custom logic is involved, check for any user exits or BAdIs that might be affecting the billing process.
  
  By following these steps, you should be able to identify and resolve the cause of the AH599 error in your SAP system.