how does an SNP Location Heuristic Deletes Planned Orders?

Hi,

when i run Location Heuristic in planning book ( //SDP94 ), it removes the previous orders and creates new ordres per demand.

but when i refresh the screen, the old orders are retrieved back in planning book.

i want to know how does it do the same at the backend.

i want to incorporate same functionality in my custom BADI in optimizer run.

right now, when i delete orders in my BADI using BAPi_MOSRVAPS_DELEMULTI, the deleted orders are reverted after i refresh screen but they get deleted when i save the planning book after some iteration.

thanks

Gaurav