DP91 Debit Memo Requests and combined Milestone Invoices

Resource Related Billing

We want to manage a project for fixed price milestone billing along with actual expense elements

Therefore in the contract

One line of fixed price milestone including billing plan

One line of T&M that will be billed from DP91 - linked to DIP profile

Is there anyway to consolidate the fixed price element from the contract into the Debit memo request?

I can produce invoices for both elements and then combine from an invoice list later in the process, but would like to know if anyone had managed to collective alloacte the line items within the original DMR.....

Thanks

Steve