How To Fix BC423 - Error in monthly rule: Invalid day, month, or week specified

SAP Error Message - Details

• Message type: E = Error

• Message class: BC - Scheduler (calendar)

• Message number: 423

• Message text: Error in monthly rule: Invalid day, month, or week specified

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message BC423 - Error in monthly rule: Invalid day, month, or week specified ?

  The SAP error message BC423, which states "Error in monthly rule: Invalid day, month, or week specified," typically occurs in the context of scheduling or planning activities, particularly when dealing with periodic tasks or rules that are set up in the system. This error indicates that there is an issue with the configuration of a monthly rule, such as an invalid day, month, or week specification.
  Causes:
  
  Invalid Day Specification: The day specified in the monthly rule may not exist (e.g., specifying the 30th of February).
  Invalid Month Specification: The month specified may be out of range (e.g., specifying a month number greater than 12).
  Invalid Week Specification: If the rule is based on weeks, it may reference a week that does not exist in the specified month.
  Incorrect Configuration: The configuration of the scheduling or planning task may have been set up incorrectly, leading to invalid parameters.
  Data Entry Errors: Manual entry errors when setting up the monthly rule can lead to invalid values being saved.
  
  Solutions:
  
  Review the Monthly Rule Configuration: Check the configuration of the monthly rule in the relevant transaction (e.g., transaction codes like CRON or similar) to ensure that all specified days, months, and weeks are valid.
  Correct Invalid Entries: If you find any invalid entries (like a non-existent day or month), correct them to valid values.
  Use Standard Values: If possible, use standard or predefined values for days and months to avoid manual entry errors.
  Consult Documentation: Refer to SAP documentation or help resources for guidance on setting up monthly rules correctly.
  Test Changes: After making corrections, test the configuration to ensure that the error does not reoccur.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes that deal with scheduling and planning, such as CRON, SM37 (for job monitoring), or others specific to your SAP module.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Forums: Engage with SAP community forums or user groups for additional insights and solutions from other users who may have encountered the same issue.
  System Logs: Review system logs for additional context or related error messages that may provide more information about the root cause.
  
  By following these steps, you should be able to identify and resolve the issue causing the BC423 error in your SAP system.