How To Fix 1G640 - Caution: Cannot change Int. Calc. methd retroactively: Used by date = &1

SAP Error Message - Details

• Message type: E = Error

• Message class: 1G - BKK: Konditionen

• Message number: 640

• Message text: Caution: Cannot change Int. Calc. methd retroactively: Used by date = &1

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message 1G640 - Caution: Cannot change Int. Calc. methd retroactively: Used by date = &1 ?

  The SAP error message 1G640 indicates that there is an issue with changing the internal calculation method retroactively due to its association with a specific "used by date." This typically occurs in the context of financial or controlling modules where internal calculation methods are defined for various processes, such as cost allocation or pricing.
  Cause:
  The error arises when you attempt to change the internal calculation method for a period that has already been processed or closed. The "used by date" refers to the date from which the current calculation method is in effect. If there are transactions or postings that have already been made using the existing calculation method, SAP prevents you from making retroactive changes to ensure data integrity and consistency.
  Solution:
  To resolve this error, consider the following steps:
  
  
  Check the Used By Date: Identify the "used by date" mentioned in the error message. This date indicates the point from which the current calculation method is in effect.
  
  
  Review Transactions: Look for any transactions or postings that have been made after the "used by date." If there are transactions that rely on the current calculation method, you cannot change it retroactively.
  
  
  Change Future Settings: If you need to change the internal calculation method, you can do so for future periods. Ensure that you set the new calculation method to take effect from a date after the last transaction date.
  
  
  Consult Documentation: Review SAP documentation or configuration guides related to the specific module you are working with (e.g., Controlling, Financial Accounting) to understand the implications of changing calculation methods.
  
  
  Seek Help from SAP Support: If you are unsure about the implications of changing the calculation method or if you need to make a change for a closed period, consider reaching out to SAP support or your internal SAP team for guidance.
  
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like OKB9 (for cost center accounting) or OBY6 (for financial accounting) to review or change settings related to internal calculation methods.
  Configuration Settings: Familiarize yourself with the configuration settings in the SAP system that govern internal calculation methods, as these can vary based on the specific business processes in use.
  Testing: Always test changes in a development or quality assurance environment before applying them to the production system to avoid unintended consequences.
  
  By following these steps, you should be able to address the error and make the necessary adjustments to your internal calculation methods in SAP.