Difference between BAPI_MOSRVAPS_DELEMULTI and /SAPAPO/OM_ORDER_DELETE

Hi all,

i am not able to understand the main difference between the 2 FMs. both can be used to Delete Planned Orders.

when i use BAPI_MOSRVAPS_DELEMULTI in my optimizer badi, the deleted orders do not show up in planning book.

wherease if i use /SAPAPO/OM_ORDER_DELETE, the orders are deleted from Live cache but still they show up in Planning book.

Please advise.

Thanks

Gaurav