Roll Back Posting Routines

Hi all,
I have created qty assemble to order in Service Order
I follow all the steps and codes from sales order
but the thing is if there is an error, then it will posted half way (there are records in Service Ledger Entry & Item Ledger Entry, but no service shipment and invoice)
Scenario :
Line 1 (no qty assemble to order)
Line 2 (with qty assemble to order)
Line 3 (no qty assemble to order) -> for example here is the error

then Line 1 and 2, already posted to service ledger
I want to follow like sales order.
if there is an error in any line, then it will not create any lines in service ledger
any clue what i miss?
Thanks