How To Fix RU120 - Activity & cannot be entered

SAP Error Message - Details

• Message type: E = Error

• Message class: RU - Messages for order completion confirmation

• Message number: 120

• Message text: Activity & cannot be entered

What causes this issue?

In the work center the maintenance rule for the standard value prevents
you from entering an activity.

How to fix this error?

If you want to enter an activity for this standard value, you must
first change the relevant maintenance rule in the work center so that
you are allowed to enter an activity.

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Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message RU120 - Activity & cannot be entered ?

  The SAP error message RU120 ("Activity & cannot be entered") typically occurs in the context of project management or controlling when trying to enter an activity that is not valid or not allowed in the current context. This error can arise in various scenarios, such as when working with project systems (PS), controlling (CO), or other modules where activities are defined.
  Causes of RU120 Error
  
  Invalid Activity: The activity you are trying to enter may not exist or may not be valid for the current project or task.
  Activity Status: The activity might be in a status that does not allow for further entries (e.g., closed, completed).
  Authorization Issues: The user may not have the necessary authorizations to enter or modify the activity.
  Configuration Issues: There may be configuration settings in the system that restrict the entry of certain activities based on project type, status, or other criteria.
  Missing Master Data: Required master data for the activity (like work centers, cost centers, etc.) may be missing or incorrectly configured.
  
  Solutions to RU120 Error
  
  Verify Activity: Check if the activity you are trying to enter is valid and exists in the system. You can do this by navigating to the relevant project or task and confirming the activity's details.
  Check Activity Status: Ensure that the activity is not in a status that prevents further entries. If it is closed or completed, you may need to reopen it or create a new activity.
  Review Authorizations: Ensure that you have the necessary permissions to enter or modify the activity. If not, contact your system administrator to grant the required authorizations.
  Configuration Review: Consult with your SAP configuration team to review the settings related to project management or controlling to ensure that they allow for the entry of the activity in question.
  Master Data Check: Ensure that all required master data related to the activity is correctly set up and available in the system.
  
  Related Information
  
  Transaction Codes: Depending on the context, you may be using transaction codes like CJ20N (Project Builder), CJI3 (Project Actual Line Items), or others related to project management.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. You can search the SAP Support Portal for relevant notes.
  Documentation: Review SAP documentation related to project management and controlling for best practices and guidelines on activity management.
  
  If the issue persists after checking the above points, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the relevant module.