How To Fix /SAPAPO/BWEX001 - Function module for info source &1 was not found in customizing

/SAPAPO/BWEX001 - Overview

• Message type: E = Error

• Message class: /SAPAPO/BWEX -

• Message number: 001

• Message text: Function module for info source &1 was not found in customizing

Self-Explanatory Message

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/SAPAPO/BWEX001 - Details

• The SAP error message /SAPAPO/BWEX001 indicates that a function module for the specified InfoSource could not be found in the customizing settings. This error typically occurs in the context of SAP Advanced Planning and Optimization (APO) when there is an issue with the integration between SAP APO and SAP BW (Business Warehouse).
  
  Cause:
  
  Missing Function Module: The function module that is supposed to be associated with the InfoSource is not defined in the customizing settings.
  Incorrect Customizing: The InfoSource may not have been properly configured in the SAP system.
  Transport Issues: If the customizing settings were transported from one system to another (e.g., from development to production), the transport may not have included the necessary function module.
  Version Mismatch: There may be a version mismatch between the SAP APO and SAP BW systems, leading to missing or incompatible function modules.
  
  
  Solution:
  
  
  Check Customizing Settings:
  
  Go to the transaction code RSA1 in SAP BW.
  Navigate to the InfoSources and check