Line item based approval

Hi All,

I have line item based approval workflow WS14500015. My shopping cart has multiple line items each awaiting approval from multiple approvers.

Now my requirement is when any approver approves his line items , that particular line items should not be allowed for changes even though the shopping cart has status awaiting approval coz others line items are still awaiting approval .

Is this possible i.e user should be able to make changes to unapproved line items abut not approved line items .

Can i user badi BBP_WFL_SECURE_BADI for this ?? Please if anyone has already done this please share your inputs .

Thanks in advance

Iftekhar Alam