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

I10028 - Overview

• 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