How To Fix CN851 - Minimum duration must not exceed standard duration

SAP Error Message - Details

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 851

• Message text: Minimum duration must not exceed standard duration

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 CN851 - Minimum duration must not exceed standard duration ?

  The SAP error message CN851 ("Minimum duration must not exceed standard duration") typically occurs in the context of project management and network planning within SAP, particularly when dealing with activities in a project network. This error indicates that the minimum duration set for a particular activity is greater than the standard duration defined for that activity, which is not allowed.
  Cause:
  
  Incorrect Duration Settings: The minimum duration for an activity has been set to a value that exceeds the standard duration. This can happen due to manual entry errors or incorrect configuration.
  Project Planning Parameters: The project planning parameters may not be aligned correctly, leading to inconsistencies in duration settings.
  Activity Type Configuration: The configuration of the activity type may not be set up properly, causing conflicts between minimum and standard durations.
  
  Solution:
  
  
  Check Activity Durations:
  
  Go to the activity in question and review the duration settings.
  Ensure that the minimum duration is less than or equal to the standard duration.
  
  
  
  Adjust Minimum Duration:
  
  If the minimum duration is incorrectly set, adjust it to a value that is less than or equal to the standard duration.
  
  
  
  Review Project Parameters:
  
  Check the project parameters and settings to ensure they are configured correctly.
  Make sure that the standard duration is set appropriately for the activity type.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or help resources for guidance on setting up project activities and durations correctly.
  
  
  
  Testing:
  
  After making adjustments, test the changes by attempting to save or process the activity again to ensure the error is resolved.
  
  
  
  Related Information:
  
  Transaction Codes: You may use transaction codes like CJ20N (Project Builder) or CN22 (Change Network) to access and modify project activities.
  SAP Notes: Check for any relevant SAP Notes that may address specific issues related to this error message.
  User Roles and Authorizations: Ensure that you have the necessary permissions to make changes to project activities and their settings.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in project management within SAP.