Hi Gino ,
There is no standard way of adding the notification long text field on the order TECO pop-up screen. However you can create a custom pop up on clicking of TECO icon :
IWO10004-Maintenance order: Customer check for order completion
In case you want pop-up at save event then below exit can be used :
IWO10009-Maintenance order: Customer check for "Saving"
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