How To Fix CN813 - Enter activity number

CN813 - Overview

• Message type: E = Error

• Message class: CN - Meldungen für Netzpläne

• Message number: 813

• Message text: Enter activity number

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.

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CN813 - Details

• The SAP error message CN813 "Enter activity number" typically occurs in the context of project management or controlling modules, particularly when working with network activities in SAP Project System (PS) or related areas. This error indicates that the system expects an activity number to be entered, but it has not been provided.
  
  Cause:
  
  Missing Activity Number: The most common cause is that the user has not entered an activity number in the relevant field where it is required.
  Incorrect Screen Navigation: The user may have navigated to a screen that requires an activity number without having selected or created one.
  Data Entry Error: The user may have inadvertently deleted or not filled in the required field.
  
  
  Solution:
  
  Enter Activity Number: The most straightforward solution is to enter a valid activity number in the field where the error is being triggered.
  Check Project Structure: Ensure that the project structure is correctly set up and that the activity you