Hello
Please use the User exit -->IWO10004 Maintenance order: Customer check for order completion
Or
WO10009 PM Order: Customer Check for 'Save' Event
In This User Exit write code in such way that it will call BADI--> ALM_ME_NOTIF_HEADER.
So This BADI will update the Breakdown details in each Notification which are maintain in Work order.
Br
Rakesh