How To Fix I10028 - Constraint for activity start date must not be modified

SAP Error Message - Details

• Message type: E = Error

• Message class: I10 - Work Management IDocs Messages

• Message number: 028

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

What causes this issue?

You probably tried to modify NTANF field (constraint for activity start
date) 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 NTANF field unless you first 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 I10028 - Constraint for activity start date must not be modified ?

  The SAP error message I10028, which states "Constraint for activity start date must not be modified," typically occurs in the context of project management or production planning within SAP. This error indicates that there is a constraint on the start date of an activity that is being violated, often due to changes being made to the scheduling or planning of that activity.
  Cause:
  
  Constraints on Dates: The activity may have specific constraints set, such as "Must Start On," "Must Finish On," or "Start No Earlier Than," which prevent changes to the start date.
  Dependencies: The activity may be dependent on other activities, and changing the start date could violate these dependencies.
  Locked Activities: The activity might be locked for editing due to its status in the project lifecycle or because it is part of a released project.
  Project Settings: Certain project settings or configurations may restrict modifications to activity dates.
  
  Solution:
  
  Review Constraints: Check the constraints set on the activity. You can do this by navigating to the activity in the project and reviewing its properties. If necessary, adjust or remove the constraints if they are no longer applicable.
  Check Dependencies: Review any predecessor or successor relationships that might be affecting the start date. Ensure that changing the start date does not violate these relationships.
  Unlock Activity: If the activity is locked, you may need to unlock it or change its status to allow for modifications. This may require appropriate permissions.
  Consult Project Settings: Review the project settings to ensure that there are no overarching rules or configurations that prevent changes to activity dates.
  Use Transaction Codes: Utilize relevant transaction codes (like CJ20N for project management) to access and modify the project structure and activity details.
  
  Related Information:
  
  SAP Documentation: Refer to the official SAP documentation for project management or production planning for more detailed information on constraints and scheduling.
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message.
  User Permissions: Ensure that you have the necessary permissions to make changes to the project activities.
  Training and Support: If you are unsure about how to proceed, consider reaching out to your SAP support team or consulting with a colleague who has experience in project management within SAP.
  
  By following these steps, you should be able to identify the cause of the error and implement a solution to resolve it.