How To Fix BIL128 - TOU excpt.prog.&1 triggers rates &2 and &3 that substitute the basic rate

SAP Error Message - Details

• Message type: E = Error

• Message class: BIL - General billing

• Message number: 128

• Message text: TOU excpt.prog.&1 triggers rates &2 and &3 that substitute the basic rate

What causes this issue?

The time-of-use exception program &V1& uses the assigned conditional
billing program to trigger two different conditional rates &V2& and &V3&
, which both have the rate relationship category "Substitution" in a
rate relationship group. This is not permitted as the substitution of
the basic rate would not be unique during billing.
The assignment to billing program &V4& is not permitted.

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?

Correct your entries. For example, you could change the rate
relationship category of a rate to "Supplement", or you could change the
structure of your conditional billing program.

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 BIL128 - TOU excpt.prog.&1 triggers rates &2 and &3 that substitute the basic rate ?

  The SAP error message BIL128 typically relates to billing and invoicing processes within the SAP system, particularly in the context of utilities or services that involve time-of-use (TOU) rates. The message indicates that there is an exception in the program that triggers specific rates, which may be substituting the basic rate for billing purposes.
  Cause:
  
  Configuration Issues: The error may arise from incorrect configuration of the rate structures in the SAP system. This could include issues with the TOU rate setup, such as missing or incorrect rate definitions.
  Data Inconsistencies: There may be inconsistencies in the master data or transactional data that lead to the system not being able to correctly apply the rates.
  Program Logic Errors: The underlying program logic may have exceptions that are not being handled correctly, leading to the error message being triggered.
  Missing Rate Validity: The rates being referenced (&2 and &3) may not be valid for the period in question, or there may be a mismatch in the expected rate types.
  
  Solution:
  
  Check Configuration: Review the configuration settings for TOU rates in the SAP system. Ensure that all necessary rate types are defined and correctly linked to the relevant billing categories.
  Validate Master Data: Ensure that the master data for customers, contracts, and billing items is complete and accurate. Look for any missing or incorrect entries that could affect rate application.
  Review Program Logic: If you have access to the ABAP code, review the program logic that triggers this error. Look for any exception handling that may need to be adjusted.
  Rate Validity Check: Verify that the rates being referenced are valid for the billing period in question. Check the validity dates and ensure that the rates are active.
  Consult Documentation: Refer to SAP documentation or notes related to billing and TOU rates for any known issues or patches that may address this error.
  Testing: After making changes, conduct thorough testing to ensure that the issue is resolved and that billing processes function as expected.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific notes related to error BIL128. SAP frequently releases notes that address known issues and provide solutions.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SPRO for configuration, SE80 for program analysis, and SE38 for executing reports.
  Support: If the issue persists, consider reaching out to SAP support or your internal SAP team for further assistance.
  
  By following these steps, you should be able to identify the root cause of the BIL128 error and implement a solution to resolve it.