Window Calculation is not triggered when incident is closed

Version 2

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    Service Desk 2016.xService Desk 2017.x


    I have a calculation that hides a field depending on another field value (Field that trigger calculation)
    My calculation works fine until the incident is not closed

    When incident is closed and come back to incident form, I found that field is displayed and seems that calculation is not triggered



    Attempting to write to the _BDFFlagMepCritical attribute of a ChangeManagement.Change lifecycle object as read-only. When a lifecycle object reaches a read-only state, it can not be changed through a lifecycle action.



    When arriving at the status closed the type of this status is Read Only which makes the whole window ReadOnly and unfortunately it cannot be changed by Window Calculation then, all the attributes must stay Read Only.