Problems with future invoices if I modify an invoice created from milestone completio

Turn off Consolidate Projects on Sales Transactions because milestone billing will not work with this on.  See defect 153283.

Create Sales order using service items that create projects.
Create project from the New option in the Project drop down list box on the sales order.

Set Billing Type to Fixed Bid, Milestone Billing on the Financial tab of the project.

Create Billing Schedule with initial amount % and subsequent milestone % amounts.

Bill initial amount from Sales Order to Bill (bulk billing).  Modify invoice created by changing % on a couple of the line items so that Revenue Recognition occurs correctly for this portion of the billing, none are 100% billed after modification.  Delete remaining line items that should not have Rev Rec occur for this billing.