How To Fix I10029 - Constraint for activity start time must not be modified

SAP Error Message - Details

• Message type: E = Error

• Message class: I10 - Work Management IDocs Messages

• Message number: 029

• Message text: Constraint for activity start time must not be modified

What causes this issue?

You probably tried to modify NTANZ field (constraint for activity start
time) when EINSA field (constraint on the basic start date for
activity) has 1 or 5 as value.

How to fix this error?

You cannot update NTANZ field unless you modify EINSA field.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message I10029 - Constraint for activity start time must not be modified ?

  The SAP error message I10029, which states "Constraint for activity start time must not be modified," typically occurs in the context of project management or production planning within SAP. This error indicates that there is an attempt to change the start time of an activity that is constrained by certain rules or dependencies, which are preventing the modification.
  Cause:
  
  Dependency Constraints: The activity may have dependencies on other activities that dictate its start time. For example, it may be linked to a predecessor activity that must be completed before it can start.
  Scheduling Constraints: There may be scheduling constraints set in the project or production order that prevent changes to the start time.
  Locked Activities: The activity might be locked due to the current status of the project or order, preventing any modifications.
  Resource Availability: If the resources required for the activity are not available, the system may prevent changes to the start time.
  
  Solution:
  
  Check Dependencies: Review the dependencies of the activity. Ensure that any predecessor activities are completed or that their constraints are adjusted if necessary.
  Review Scheduling Constraints: Look into the scheduling settings for the project or order. If there are constraints that are too strict, consider adjusting them.
  Unlock the Activity: If the activity is locked, check the status of the project or order. You may need to change the status to allow modifications.
  Resource Planning: Ensure that the necessary resources are available for the activity. If not, consider rescheduling the activity to a time when resources are available.
  Consult Documentation: Refer to SAP documentation or help resources for specific guidance on handling constraints in your version of SAP.
  
  Related Information:
  
  Transaction Codes: You may need to use transaction codes like CJ20N (Project Builder) or CO02 (Change Production Order) to access and modify project or order details.
  SAP Notes: Check for any relevant SAP Notes that might address this specific error or provide additional troubleshooting steps.
  User Permissions: Ensure that you have the necessary permissions to make changes to the project or order.
  Consult with SAP Support: If the issue persists, consider reaching out to SAP support for further assistance.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.