Bunching of shopping cart (Grouping of SC)

Hi Experts,

I am working on Grouping of shopping cart based upon the Vendor and delievery address.

I am using the program BBP_SC_TRANSFER_GROUPED to group the SC also Badi BBP_GROUP_LOC_PO in order to handle Vendor and delievery address.

The concern is am able to group SC and PO is happening always under ORDER mode, But i want PO to be generate always in "SAVED" MODE or purchasers worklist , so that i can handle mandatory customer field as check box ( PO complete indicator) on PO before it get order.

I request is there any way We can handle PO should create in SAVE mode rather than getting ordered ??

Pls share your inputs.