How To Fix /SAPAPO/ATP121 - Error when reading ATP Customizing

/SAPAPO/ATP121 - Overview

• Message type: E = Error

• Message class: /SAPAPO/ATP -

• Message number: 121

• Message text: Error when reading ATP Customizing

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/ATP121 - Error when reading ATP Customizing ?

  The SAP error message /SAPAPO/ATP121 typically indicates an issue related to the Advanced Planning and Optimization (APO) module, specifically when the system is trying to read the Available-to-Promise (ATP) customizing settings. This error can arise due to various reasons, including configuration issues, missing data, or inconsistencies in the settings.
  Causes of the Error
  
  Missing Customizing Settings: The ATP customizing settings may not be properly defined or may be missing entirely.
  Inconsistent Data: There may be inconsistencies in the data related to ATP configuration, such as missing or incorrect entries in the relevant tables.
  Authorization Issues: The user may not have the necessary authorizations to access the ATP customizing settings.
  Transport Issues: If the customizing settings were transported from one system to another, there may have been issues during the transport process that led to incomplete or incorrect settings.
  System Errors: There could be underlying system errors or bugs that are causing the issue.
  
  Solutions
  
  
  Check Customizing Settings:
  
  Navigate to