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Postwork script are commonly used perform tasks after task is completed. This script may be useful like updating databases or generating documents by user entered data.

Because task is already completed some operations (example; trying to set action on current workitem) are invalid at this stage and error is thrown.

In prework script following objects are available:

$WorkItem
Current workitem instance.

$Xml
Xml data navigator for data model.

Common operations

Updating data model by action

Assign completion date to Data Model if user selects "Approve" action.

if ( $WorkItem.SelectedAction == 'Approve' ) {
   $Xml.SetValue("ApprovedAt", $WorkItem.End );
}