How To Fix CJ523 - You cannot assign the activity number

CJ523 - Overview

• Message type: E = Error

• Message class: CJ - Project master data and structure

• Message number: 523

• Message text: You cannot assign the activity number

What causes this issue?

The system could not assign a unique number to the activity while you
were creating it in a Gantt chart.

System Response

INCLUDE 'NA_ALLG_NOFUNKTION' OBJECT DOKU ID TX

How to fix this error?

Maintain the activities in time scheduling using the function
<ZH>Detail dates</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message CJ523 - You cannot assign the activity number ?

  The SAP error message CJ523 ("You cannot assign the activity number") typically occurs in the context of project management within SAP, particularly when dealing with project structures, activities, or WBS (Work Breakdown Structure) elements. This error can arise due to various reasons, and understanding the cause is essential for finding a solution.
  Causes of Error CJ523
  
  
  Activity Number Already Exists: The activity number you are trying to assign may already be in use or may not be unique within the project.
  
  
  Incorrect Project Status: The project or WBS element may be in a status that does not allow for changes, such as being locked or completed.
  
  
  Authorization Issues: The user may not have the necessary permissions to create or modify activities within the project.
  
  
  
  Configuration Issues: There may be configuration settings in the project system that restrict the assignment of activity numbers.
  
  
  Missing or Incorrect Master Data: Required master data (like activity types or cost elements)