How To Fix /SAPAPO/CTM1421 - Error occurred while reading the sources of supply (in-house production)

SAP Error Message - Details

• Message type: E = Error

• Message class: /SAPAPO/CTM1 -

• Message number: 421

• Message text: Error occurred while reading the sources of supply (in-house production)

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message /SAPAPO/CTM1421 - Error occurred while reading the sources of supply (in-house production) ?

  The SAP error message /SAPAPO/CTM1421 indicates that there was an issue while reading the sources of supply for in-house production during the Capacity Planning or Supply Network Planning processes in SAP Advanced Planning and Optimization (APO). This error typically arises in the context of the Capacity Planning Tool (CTM) when the system is unable to retrieve or process the necessary data related to production resources.
  Causes:
  
  Missing Master Data: The error may occur if there are missing or incomplete master data records for the production resources, such as work centers, production versions, or material master data.
  Configuration Issues: Incorrect configuration settings in the APO system or in the integration with the ERP system can lead to this error.
  Authorization Issues: The user executing the process may not have the necessary authorizations to access the required data.
  Data Consistency Issues: Inconsistencies in the data, such as incorrect or missing entries in the planning books or data views, can trigger this error.
  System Performance: If the system is under heavy load or if there are performance issues, it may fail to read the sources of supply in a timely manner.
  
  Solutions:
  
  Check Master Data: Verify that all relevant master data (work centers, production versions, material master) is complete and correctly maintained. Ensure that the in-house production resources are properly defined.
  Review Configuration: Check the configuration settings in both the APO and ERP systems to ensure they are correctly set up for the planning process.
  User Authorizations: Ensure that the user has the necessary authorizations to access the required data. This may involve checking roles and permissions in the SAP system.
  Data Consistency Check: Perform a consistency check on the planning books and data views to identify and correct any inconsistencies.
  System Performance Monitoring: Monitor system performance and check for any issues that may be affecting data retrieval. If necessary, optimize the system or schedule the planning runs during off-peak hours.
  
  Related Information:
  
  Transaction Codes: You may want to use transaction codes like /SAPAPO/CTM for Capacity Planning or /SAPAPO/MC90 for checking the master data.
  SAP Notes: Check for any relevant SAP Notes that may address this specific error or provide additional troubleshooting steps.
  Logs and Traces: Review the application logs and traces to gather more information about the error context, which can help in diagnosing the issue.
  SAP Community: Engage with the SAP Community or forums for insights from other users who may have encountered similar issues.
  
  By following these steps, you should be able to identify the root cause of the error and implement the necessary solutions to resolve it.