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

1G640 - Overview

• 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