How To Fix 1M028 - For period unit week only key date values 1-7 (Mo.-Su.) allowed

SAP Error Message - Details

• Message type: E = Error

• Message class: 1M - BKK: Abschluß

• Message number: 028

• Message text: For period unit week only key date values 1-7 (Mo.-Su.) allowed

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 1M028 - For period unit week only key date values 1-7 (Mo.-Su.) allowed ?

  The SAP error message 1M028 indicates that when working with period units defined as "week," only key date values corresponding to the days of the week (1 for Monday through 7 for Sunday) are allowed. This error typically arises in scenarios involving planning, reporting, or data entry where a week-based period unit is expected.
  Cause:
  The error occurs when:
  
  A user attempts to enter a key date that is not within the valid range for a week (i.e., any value other than 1-7).
  The system is expecting a specific day of the week but receives an invalid input.
  
  Solution:
  To resolve this error, you should:
  
  
  Check Input Values: Ensure that the key date you are entering corresponds to a valid day of the week. For example:
  
  1 = Monday
  2 = Tuesday
  3 = Wednesday
  4 = Thursday
  5 = Friday
  6 = Saturday
  7 = Sunday
  
  
  
  Adjust Data Entry: If you are entering a date or period that does not align with these values, adjust your input accordingly.
  
  
  Review Configuration: If this error occurs frequently or in unexpected scenarios, review the configuration settings for the relevant module (e.g., planning, reporting) to ensure that the period unit and key date settings are correctly defined.
  
  
  Consult Documentation: Refer to SAP documentation or help resources for additional context on how to work with period units and key dates.
  
  
  Related Information:
  
  SAP Modules: This error can occur in various SAP modules, including SAP BW (Business Warehouse), SAP ERP, and others that involve planning and reporting.
  Key Date Usage: Understanding how key dates are used in your specific SAP implementation can help prevent this error in the future.
  SAP Notes: Check for any relevant SAP Notes or updates that might address this error or provide additional guidance.
  
  If the issue persists after following these steps, consider reaching out to your SAP support team or consulting with an SAP expert for further assistance.