Partial rejection of some of lines in multiline cart for header level SC WF

Hi,

We are on SRM 7.1 ECS.

We ahve configured the N step process level workflow for shopping cart at the header level(for entire document).

The issue we are facing is doing partial rejection.Earlier in SRM 5,even though the header level worklfow was activated when an approver used to get a work item,he could see two radio buttons,one for APPROVE and other for REJECT so that he could partially reject some of the lines(for a multi line cart).

Now in SRM 7,how do I partially reject lines in a multiline cart if the PCW is active at header level i.e. decision type is "Decison for entire document".

Pls advise.